For this reason, I wanted to produce the ground interior temperature using an mathematical expression in initial values node (and not in temperature node). Returns description of the looplevel level. The options for concatenating, using summations, and copying solutions make it possible to combine solutions for easier postprocessing as well as to store and analyze multiple solutions for different variants of a model. level==getMaxLevels()-1 the values are expanded into tuples for the (time-dependent adaption or for automatic remeshing). 3. Jesus. You can then either explicitly or implicitly remove or save data from the model, as shown in the screenshots below. I am using COMSOL 4.1. Provide constant power regardless of time of day or weather. How Large of a Model Can You Solve with COMSOL? if you join first dataset with one and the second one with all, Comsol gives out errors while making tables This mathematical expression contains the variables z and t. But unfortunately, only a specified time (by default, t=0) is used in time-dependent analysis and the time range defined for the expression is not considered. When we then recompute with changes to the model or solver settings, the new solution is available through the original Solution data set, so that we can postprocess and evaluate both solutions by pointing to one of the two data sets (we can extend this approach to create additional solutions). According to Saint-Venants Principle, the difference in the solution should diminish as you go further from the loaded edge. outersolnum. In the case of parametric sweeps or in time dependent solutions, each base solution contains more than one data set. This model shows how a cylindrical object heats up when the temperature on its exterior boundaries changes from 0C to 1000C at the start of the simulation, which runs for 190 s. Lets see what happens if we add another time-dependent study step, which starts at 190 s where the boundaries are instead thermally insulated. Result enveloping settings. Evaluate expression for different (specific) solutions Posted 26 aot 2013, 16:58 UTC+2 Parameters, Variables, & Functions, Results & Visualization Version 4.3, Version 4.3a, Version 4.3b 3 Replies Nikita Kondratiev For questions related to your modeling, please contact our Support team. This function works even if Yes, there is a link in the blog post that takes you to the Application Gallery, where the Axisymmetric Transient Heat Transfer example model is available: https://www.comsol.com/model/axisymmetric-transient-heat-transfer-267. if you join first dataset with all and the second one with one, you cant get to other solutions from second dataset You do need to add a paragraph to address integration of explicitly joined data sets in the axisymmetric case: In essence, we are constructing an operator that can later be used with any quantity defined in both of the original base solutions. Vulnerable often vandalized for their parts (batteries and solar panels) 4. function works even if isValid returns false. Get the number of levels in this solution. case when there is more than one. Hi, I'm a relatively new user in COMSOL. can be different and the output is expanded to the outer product of To join solutions, right-click on Data Sets under "Results" and choose Join. But there is currently no way to parameterize the solver based on the for-loop index, so the time lists will be the same for each iteration. Let us take a look at how this operator is implemented and then examine how it can be used for . The difference in effective stresses is close to zero, evaluated using a Join data set. In your case it should be data2(imag(u)). You only need to use one Heat Transfer in Solids interface, with a Thermal Insulation node added from the start, but followed by a Temperature node, which defines a fixed temperature on the same boundaries and thus overrides the thermal insulation. Short-lived do not last very long before they stop working The columns are the tuples. The numerical solution to the discretized form of the governing equations, represented in the preceding sections, is obtained by using the "Study" node in COMSOL. The difference between this and the Solution Copy operation is that a duplicated Solution data set does not create a new solution and, by default, refers to the same solution as the original data set. Retrieves the imaginary part of all imaginary parameter values Returns the one based indices available for a given level. The Solar Glow range was designed to address the failings seen in existing products and answer some of the critical needs emerging today. what is the expression for Space Charge Density in COMSOL V4.1 ? During the engineering design stage the plant is optimized to minimize the effect loss on both the PV side (DC) and the connection to the grid (AC). solnums. I will pass your comment about the all-all combination to the development team. Download Brochure. Hi Magnus, levels.length==0, an error will be given if level is such that the Returns the maximum number of inner solutions for the given outer Get the parameter name for the loop level. Nov 2016. By providing your email address, you consent to receive emails from COMSOL AB and its affiliates about the COMSOL Blog, and agree that COMSOL may process your information according to its Privacy Policy. a zero array is returned. Then when you have a nested parametric sweep or one parametric + 1 transient, if you postprocess via the Defined variable you get double nested tables. Returns the one based inner solution numbers for the outer solution if you try to join both with all solutions it just gives out an error Im doing Solar PV Cell with different structures by using a 2D model physics & I used electromagnetic waves and frequency domain, study I have used frequency domain, as result of that I get reflectance data for different wavelengths and after I tried to design the si_solar_cell_1D model as per the COMSOL design instruction procedure after simulated, I get the I-V and P-V Curve of solar cell. The Combine Solution node together with a Solution Store inside a for-loop should be able to accumulate all the solutions. listed if standards is not an option). Great that you found this blog post to be helpful. CX Specific is also appropriate for certain large enterprise and ISP requirements where bandwidth demands may extend up to 1 Gbps and beyond. Thanks for the feedback. The solution with a load acting upward (left) and the original solution, with a load acting downward (right). with() operator doesnt work with data2 Get the names of the different levels, split into an array for the . Solution to the problem: The best way of evaluating a point's data is by using COMSOL live link with MATLB. Hello Hossein, COMSOL Multiphysics version 5.1 includes a Previous Solution operator within time-dependent studies. If you see the mathematical expressions in the red boxes, they are different quantities. Whether this is for facility or residential level installations, systems can be specified according to need, starting from UPS function (30 minutes for a safe shutdown) to multi-day autonomy for periods of reduced sunlight. As pointed out above, when using the General method we also get an operator. When you opt for this method, COMSOL Multiphysics makes two new operators, data1 and data2, which can be used to access quantities from the first and second data set, respectively. Another option for creating additional Solution data sets is to right-click a Solution data set and choose Duplicate (or press Ctrl+Shift+D). (attached). Not yet, but it has been suggested before to introduce such a variable. . It's a fully-licensed, MEF 2.0 compliant network offering unbeatable resilience and performance, and unleashing new opportunities for your business. Please see below for answers to your three questions: 1. Returned solution is not converged. The order of the parameter values is parameters for this level. parameters associated with the solutions specified by one-based unstructured, and when levels==null or levels.length==0, an error This 1. solve COMSOL model A. Now I do not know exactly what to do to solve this problem. Please see the COMSOL Reference Manual for details on these operators. These are 2: https://www.comsol.com/forum/thread/attachment/407691/fig-2-fbd42f4.jpg. Retrieves the real part of the parameter values for the parameters You can fix this by pressing 'F12' on your keyboard, Selecting 'Document Mode' and choosing 'standards' (or the latest version We compute two stationary solutions using first the uniform load and then the triangular load. Returns the level representation of index-one based outer and inner Your internet explorer is in compatibility mode and may not be displaying the website correctly. false. it is not available in the prepared expression. Although it works. Results & Visualization, Studies & Solvers For these study types, solution joining can be used to evaluate some useful and interesting quantities. Instantly see which Comsol services are available in your area. fallout 4 looksmenu compendium mated by mistake novel pdf northwestern wildcard benefits level==getMaxLevels()-1 the values are expanded into tuples for the Returns the level representation of index-one based outer and inner In contrast, . Not all parameter steps returned. Solutions. Retrieves the real part of all parameter values (without duplicates) innersolnum - Inner solution numbers. When the format is unstructured, and when levels==null or Without Limits. Let us look at an example to illustrate the idea. In the Join settings window, you need to make two choices: which solutions to combine and how to combine them. Returns the one based indices available for a given level. 4. Retrieves the real part of the parameter values for the parameters Retrieves units for the parameters associated with the solutions Once you have set up a study with, say, two Time Dependent study steps and a Combine Solutions study step, then running the complete study will provide the combined results. For instance, data1(u) + data2(v) can be typed in a plot settings window, provided that u is a legitimate variable in the first solution and v is available in the second solution. Retrieves parameter names for the parameters associated with the array will be an array containing all parameter names associated with Returns the solver sequence tag for the index one based outer solution 1: https://www.comsol.com/forum/thread/attachment/407691/fig-1-4129a8d.jpg Thanks for the article. The WITH operator works only within one solution, so I have to use join if I need to combine different modes from three different data sets. 2. Looks like there are a lot of bugs here: Your internet explorer is in compatibility mode and may not be displaying the website correctly. is returned. there are no structured data to return (currently level==0 and based solution number within for the outer and inner solution numbers Right beneath Data 2, you can configure the combination method. To do this, we need learn: How to run COMSOL file and do parameter sweep through MATLAB. number outersolnum. By providing your email address, you consent to receive emails from COMSOL AB and its affiliates about the COMSOL Blog, and agree that COMSOL may process your information according to its Privacy Policy. Retrieves the imaginary part of the parameter values for the When using the Explicit combination, the situation is clearer. The concatenated solution will be for the mesh for solution 1. is the model for the first example Combining Two Time-Dependent Simulations available online? Hello, I want to ask, if there is a way to get and save the solution when I cancel/abort the simulation by myself. Hopefully this addresses most of your items. Hi all, I'm confused by using "compute" or "update solution". Basically I have a simple 2D Eigenvalue Problem which gives me 20 eigenvalues (and 20 eigenmodes) and a Parametric Sweep with 50 parameter values. Exploiting Hardware Parallelism with COMSOL Batch Sweeps. Get the description of the different levels, split into an array for I hope the developers will improve it to work as desired. Retrieves the imaginary part of the parameter values for the returned. when I just set the node, I didnt see the combined results available. The number of rows is the same as the number of The construction data1(data1(data2(with(n,u)))) also does not look time-optimized. Get the descriptions for the solutions in this level, one string for If there are no associated with the solutions specified by one-based solnums. 2) at the same time on every point? Returns the solver sequence tag for the index one based outer solution associated with solnums. but I will combine both frequency domain and semiconductor models in one simulation how to combine these two data by adding reflectance data in the in the generation and recombination of Solar PV cell 1D Model. If youre looking for ways to manage multiple solutions, version 5.3 of the COMSOL Multiphysics software offers several new tools for doing so. Its likely that some expression in some results plot or evaluation explicitly references a parameter value that is no longer part of the set of parameter values when you rerun the study. The following inequality the number of levels. We can achieve such a combined solution using the Combine Solutions study step, which is new in version 5.3 of COMSOL Multiphysics. associated with solnums. listed if standards is not an option). You can fix this by pressing 'F12' on your keyboard, Selecting 'Document Mode' and choosing 'standards' (or the latest version Returns the parameter values for a level. Returned solution is not converged, App: Improving the Payload Capacity of a Truck-Mounted Crane, Improving Convergence of Nonlinear Stationary Models, The Motions and Mechanics of a Truck-Mounted Crane. for the parameter pname in the solutions associated with solnums. Returns the parameter values for a level. Another option is to first join two data sets and then joined that joined data set with a third solution. To demonstrate the use of solution joining using the General method, we will consider two modeling examples. We users want posts like this! After computing an initial instance of the model, we right-click the Solver Configurations node in the study and choose Create Solution Copy to make a Solution Copy solution and a corresponding data set available for our current solution (pointing to the Solution Copy solution node under Solver Configurations). At the beginning I used "update solution", but didn't see any difference in the result. 2. solution numbers. We use MATLAB to run and sweep COMSOL file and extract the data after each sweep process. Suppose we enter (data1-data2)^2 in the Expression field in the Join settings window and named the new data set Join 1. According to the warning, you need to reduce the time-step of your time dependent solution. 1,,N where N is the number of values or tuples for the given In the Join settings window, you need to make two choices: which solutions to combine . solution numbers. Note that while COMSOL employees may participate in the discussion forum, COMSOL software users who are on-subscription should submit their questions via the Support Center for a more comprehensive response from the Technical Support team. Something like a for or while loop in MATLAB where you repeat several steps. Traditional Lead-acid or modern Li-ion battery solutions are available. To start a new discussion with a link back to this one, click here. Dear Temesgen, When a mutually satisfactory PPA is signed, Comsol Energy also offers to provide the necessary financing for the realization of the project through our third-party financing partners. These units can be mounted 5 -7 meters above the ground and provide road illumination in compliance with European highway standards. complex numbers so the returned list may contain duplicate real Get the subset of parameter names that are looped by an outer Comsol Energy offers a range of different PV systems that are customized to the specific needs of our clients. When Method is set to General, a field appears where you can enter an expression. While I can input it explicitly for intop and surface integration of ordinary data, I do not get that dialog for joined data set. Results & Visualization, Studies & Solvers, Transport of Diluted Species - Applying Flux to inner objects, Error: Failed to find a solution. Retrieves units for the parameters associated with the solutions the imaginary part of all parameter values associated with Returns all parameter units for the level. c_outlet (t)= c_inlet (t+1)), I placed a boundary probe (bnd) on the outlet to store the average of the c . Expensive sold as a complete unit with the attendant purchase and shipping costs. inequality holds: Get the parameter name for the loop level. If i have two solutions, one for optical modes and the other for accostical modes, at first i was intrested in doing surface integration with one optical mode and one accoustical mode so i used the join data option but now i am intrested in two optical modes and one accoustical mode so jow can i join 3 data solutions please? But you can send us an email and we'll get back to you, asap. Note that while COMSOL employees may participate in the discussion forum, . Sounds a bit cumbersome :- ) That can be done only with some external java or matlab, but what about time on one join redefinition? 1. The Join settings window. holds: Returns the maximum number of inner solutions for the given outer Do I need to rerun the compute for the combined study to be effective? outersolnum 2 and innersolnum 4. Hello Levin . number outersolnum. This consent may be withdrawn. Thanks in advance for your help. The worst is that you cant join two data sets of eigenvalue problem solutions (probably any data sets with more than one solution): parametric sweep. (without duplicates) for the parameter pname in the solutions Since intop1 is the inner operator, what gets evaluated is (intop1(T)-intop2(T))^2, which clearly is not the L2 norm of the difference. Until the point in time when insulation is added, the temperatures are the same, as expected. 3. It would be perfect if Combined Solutions could accept ANY number of (time) steps. Retrieves the imaginary part of all imaginary parameter values This is where the Explicit method comes in handy. one based settings for each level should be given. If strict is true the inner solnums will be 1) and ground interior temperature (which varies from day to day, see Fig. COMSOL Multiphysics version 5.4 brings faster solving with newer processors. The wrench models data sets for comparing the two cases and for postprocessing using only the wrench and only the bolt. To join solutions, right-click on Data Sets under Results and choose Join. An example for this is the automatically remeshed solution, which saves one solution on several meshes (multi solution). On each row, index Make sure that you use a dataset that corresponds to the combined solution during postprocessing. This are the segments we collaborate with. the format is unstructured, and when levels is set, then the When you want to use an operator with an explicitly joined data set, the correct syntax is data(operator(variable)). string of several parameters such as. How do I stitch solutions from two time dependent steps? I have a question about solutions in COMSOL. Your internet explorer is in compatibility mode and may not be displaying the website correctly. The COMSOL Multiphysics software brings a user interface and experience that is always the same, regardless of engineering application and physics phenomena.. Add-on modules provide specialized functionality for electromagnetics, structural mechanics, acoustics, fluid flow, heat transfer, and chemical engineering. These tools are generally applicable and useful in many cases beyond what we have shown here. The other five combination methods are Difference, Norm of Difference, Product, Quotient, and Sum. In each of these and other similar cases, you need access to more than one data set. whats the difference between concatenation and summation? Failed to evaluate expression. The geometry is shown in Fig. Returns all parameter names for the level. For example for 4-order non linearity I have 4 data sets of, say 1000 modes each. 2. Different battery technologies suit different applications. Then after integration I will obtain 1000 interaction values and will have to manually change the modes in all joins. associated with the solutions specified by one-based solnums. The other Solution data set contains a copy of the first solution; that is, the cases with the original load direction. Learn more about Join data sets in this blog post: To get started with managing multiple solutions, download the tutorial models featured in this blog post: See other new features and functionality in COMSOL Multiphysics version 5.3 on the. Dedicated solutions providing 48 volts for powering telecoms infrastructure are available through Comsol Energy. Returns the SolverSequence associated with the given one-based The simulation process was done by using COMSOL version 5.2a. solutions specified by one-based solnums. If you do not hold an on-subscription license, you may find an answer in another Discussion or in the Knowledge Base. Our carrier-grade offering harnesses the high-quality 28GHz spectrum to power exceptional network speeds of up to 200Mbps. In order to test the model, a cylinder with radius a=1000 m and density contrast = 100 kg m 3 with the surrounding material was used. Comsol Energy keeps an eye on what is on the market and can provide consulting to help you make the right decision regarding technology, both for today and tomorrows requirements. If, for example, solnums[5] corresponds to the tuple (2,4), Which one you want to use depends on what you are doing. compressedOutput - When false, the columns represent the tuples, which is the most general format.When true, the level settings are made unique on each level.NOTE: When true and if the compressed representation does not match the input, an array with the right number of rows but each with zero length will . 4. solve COMSOL model B. isValid returns false. The study steps for a combined solution and a reference solution with only heating. This seems like it should be simple and straight forward, but I cannot figure it out. The model seems to solve without any problem, but I can not figure out how to plot the solutions from the parametric sweep, I want to look at the evolution of the species concentration in the outflow with time for each parameter value. We are one of the few companies in the world that can supply new super capacitor technology. case when there is more than one. The problem is, if I rightclick study and hit compute, it thinks fora couple of minutes and gives me the error, "Failed to find a solution: Divergence of the linear . in COMSOL Multiphysics wasnt possible to use a transient multi solution as input under Values of variables not solved for by selecting time: all yet. all solutions that match all pnames. I will try to address some of the issues below. 19) of this case and compares it to the numerical solution. And talking of for loops, is there an iterator (an accessible variable, say iter or whatever, taking the value of the iteration: 1, 2, etc.) Thus, we end up with a composition operator when we employ a user-defined coupling operator or function with a data set joined using the General method. Comsol Connect (CX) is South Africa's preeminent point-to-multipoint licensed wireless, Layer 2, open access network that is MEF 2.0 compliant. solnums. Solution Number: 1292 Applies to: COMSOL Model Manager, COMSOL Multiphysics, COMSOL Server Versions: All versions. to return (currently level==0 and multiple inner pnames). Dangerous the solar panels are sometimes blown down by wind Business continuity is imperative. You can concatenate more than two solutions by using multiple Combine Solutions nodes and using the output from an earlier Combine Solutions node as one of the inputs to the following Combine Solutions node, in addition to another time-dependent solution that you want to concatenate to the previously concatenated solutions. To plot the absolute difference in the von Mises stress, we now make a surface plot using the Join 1 data set and solid.mises in the Expression field of the Surface settings window. Another advantage of the Explicit method is that since an expression is not fixed at the solution joining stage, you do not need to create a new joint data set to use a different expression. have the same number of rows as there are levels. intop3(data2(u)) gives out an error false the number of columns must be the same and the columns are For example, in a thermal analysis, the maximum temperature is of interest. second. 1. In the Settings window for the Combine Solutions study step, we specify the study steps to concatenate. In the second Time Dependent study step, which continues the simulation but with thermal insulation instead, the Modify physics tree and variables for study step check box is selected. getPNames(solnums). This function works even if isValid returns . So, in a nutshell, I have 50 outer solution and 20 inner solutions. Put us to the test and call us on (010) 140-8800 or email us at [email protected]. Concatenation is the most common (and the default) option: You can use it to join (concatenate) two time-dependent studies, for example, where one covers [t0, , t1] and the other [t1, , t2] so that you get one time-dependent solution for the entire time span [t0, , t2]. Required operational life. The simultaneous use of two boundary conditions (for grounds domain and piles domain) is incorrect, because it causes a meaningless temperature interference. If strict is false and if the outersolnum parameters associated with the solutions specified by one-based The cost for this course is $800 per person. The parameter Here, d(T,x) is the derivative of T with respect to x, which is a predefined operator in COMSOL Multiphysics. If you're looking for ways to manage multiple solutions, version 5.3 of the COMSOL Multiphysics software offers several new tools for doing so. Commercial enterprises Lets say that we want to run a time-dependent simulation in two steps: Further, lets say that in the second time-dependent study step, we make some changes to the physics that represent a change in the conditions for the simulated device at the intermediate time. How to Model Metabolic Reaction Networks with COMSOL, How to Create High-Quality Model Images in COMSOL Multiphysics, A Practical Implementation of Multiphysics Topology Optimization. 2) select the time series 2 dependent variables of Solver Configuration - Solver 1 - Dependent Variables 2 (Time series 2) and set them to refer to "Solver 1", for bot values solved for an not solved for. Inner and outer solution. Returns the one based inner solution numbers for the outer solution However, it seems the data2 special operator returns only the real part of its argument, only it is the data1 operator that can handle both components. Passionately Harnessing the Power of Nature! Returns the imaginary part of the parameter values for a level. The best to learn is to 1) test out and run several of the model librarie examples 2) start in 2D with MF (or 2D-axi) it solves so much quicker and hence is far easier to debug, then go to 3D. matched with the order of the parameter names returned by At some points in the domain, the maximum temperature is encountered for one set of boundary or domain conditions and at other points for other sets of conditions. The cylinder lies horizontally along the y-axis at mid-height and in the middle in the x direction in a cubic solution domain that is 10 km on a side.The rectangular prisms along all of the outer faces, edges, and . Few days back i was also facing this problem in . solutions specified by one-based solnums. multiple inner pnames). Participants are expected to have a working knowledge of COMSOL Multiphysics before attending.
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