After running a COMSOL Multiphysics simulation that yields multiple results, there are specific ways to postprocess the data. In this tutorial video, we will teach you how to implement a parametric sweep with the COMSOL software. However, precise and innovative simulation results also call for mathematical optimization. The parametric sweep is discussed starting on page 96 in the 4.3b version of the booklet, but at page 107 in the version 4.4 version of the booklet. Why does my parametric sweep slow down? commandline as in the installation and operationsguide. No problem. Posted 46 minutes ago. A parametric sweep allows you to change the parameter values through a specified range. . Right-click Study 1 and click Parametric Sweep, which adds a node where you can set up a parametric sweep In the Study Settings window, click the plus symbol and, in the drop-down list, choose the parameter DV In the Parameter value list field, write “1 2 … COMSOL Multiphysics then treats the parametric sweeps as a “nested for-loop” and indicates the nested structure using indentations of the Parametric Sweep node names. For a parametric sweep, we can expect what's called "linear scaleup" in HPC lingo. Noldus Information Technology is an industrial supplier of 10.5 software, account manager, application development, application software, art software, automated software, broadband, commercial software, computer applications, computer hardware. The parameterfile must contain the parameter values in Columns. I then defined a study with a parametric sweep on the parameter nodesIn on, let's say, 4 different values. A parametric sweep allows you to change the parameter values through a specified range. This video is all about Parametric Sweep in COMSOL Multiphysics. 3:54. The parametric sweep functionality, in contrast, performs an "outer sweep", meaning that it essentially solves a set of independent models. Instead of manually changing these property values and re-solving each time, you can perform a parametric sweep with COMSOL Multiphysics ®. The meaning of linear speed-up is the following: we take our model and run it with one, two, and four nodes and compare the compute times. The electrode height is fixed at the first defined height in the outer parametric sweep, performing a full horizontal sweep at this z position. When I try to mesh I keep getting errors, even using an extremely fine mesh. One of the core capabilities of the COMSOL Multiphysics® software is the ability to run batch sweeps, where multiple variations of the same model are solved in parallel, but in entirely separate jobs, on the same computer. Thanks, that helps! A study containing a Parametric Sweep node can be run from the command line, for example by invoking In both cases, the Parametric Sweep is running as is; that is, it runs with the parameter values stored in the Parametric Sweep node in the model. I have a geometry with about 1000 randomly placed and randomly sized cylinders that overlap. In this blog post, learn how to combine sweep studies with the built-in optimization functionality. If you. Discussion Closed This discussion was created more than 6 months ago and has been closed. Hello all! Your external Parametric Sweep node tells COMSOL to loop all around the model, (I believe not rereading Parameters, but all the rest Yes) in this way your parameter sweep can update the geometry, get the mesher to remesh, and then Solve the model. I am simulating Heat Transfer in Solid with Surface-to-Surface Radiation. The parameter cases are typically handled one after the other and all compute resources (processes and cores) assigned to the single COMSOL Multiphysics® instance are used. Description & RequirementsPARC, a Xerox company, is in the Business of Breakthroughs®. In this tutorial video, we will teach you how to implement a parametric sweep with the COMSOL ® software. Here is a simple tutorial on how to use parametric sweep in COMSOL Multiphysics 5.2 The information provided may be out of date. This means that each parameter step will be more expensive to compute since degree of freedom allocation, etc, is redone separately for each step. Use the. In this case you need to set up a nested Cluster Sweep and Parametric Sweep with an additional parameter in the Cluster Sweep that controls the offset or the parameterization of the parameter list handled by the (nondistributed) Parametric Sweep. The inner sweep in a nested parametric sweep can also be another type of sweep, such as a sweep over materials by adding a Material Sweep node below the Parametric Sweep node. This book, an updated edition of the previously published, COMSOL for Engineers, covers COMSOL5 which now includes a revolutionary tool, the Application Builder.This component enables users to build apps based on COMSOL models that can be run on almost any operating system … When I solve the model, the solver generates a solution for all the 4 parameters, but the solution is exactly the same (corresponding to the default value of nodesIn). During the simulations I want to vary the angles of some conical heat shields. Posted 20 oct. 2012 à 13:17 UTC−7 Studies & Solvers Version 4.2, Version 4.2a, Version 4.3, Version 4.3a 8 Replies You can perform several different types of sweeps in the COMSOL Multiphysics® software, including function, material, and parametric sweeps. In COMSOL Multiphysics ®, you can easily accomplish this by using work planes along with work plane operations, which include the Extrude, Revolve, Sweep, and Loft operations. This video is all about Parametric Sweep in COMSOL Multiphysics. Features include the 2D Table Surface plot type, tables, and exporting the data to other programs. Meshing issues. The overhead comes from the fact that for each parameter, a separate COMSOL Multiphysics process is started. comsol batch -input -paramfile -pname. Practicing…See this and similar jobs on LinkedIn. To find the optimal properties for a product's design, it is sometimes required to test variations of these parameters. From the table you can create a new Table Surface plot for plotting response surfaces, for example, and a new Table Graph for a graph plot of the results versus a parameter, for example. by the way, the parametrical sweep is actually at page 107. Using a simple parametric sweep study, we show you how to tabulate your data and display it in an informative way. COMSOL5 Multiphysics® is one of the most valuable software modeling tools for engineers and scientists. The information provided may be out of date. Instead of manually changing these property values and resolving each time, you can perform a parametric sweep with COMSOL Multiphysics. For a sweep where each computation is quick and doesn’t require much memory, such as this example, the computation time using a batch sweep is longer than if you used a regular parametric sweep. Consider a situation where you have solved a problem for a range of parameters using the Parametric Sweep feature in COMSOL Multiphysics and want to compare the results for This solution describes how to launch a parametric sweep, a batch sweep, or a cluster sweep simulation in COMSOL Multiphysics® from the command line. The Cluster Sweep compares to a Batch Sweep with additional settings for distributed computations. The parametric sweep can include multiple independent parameters directly for a full multiparameter sweep (solve for the first value of the first parameter combined with all values of the second parameter, then the second value of the first parameter combined with all values of the second parameter, and so on, or use a specified combination of parameter values). Yes, it is possible to run a parametric sweep in batch mode. With linear speed-up, using two nodes will be twice as fast compared to a single node, and four nodes four times as fast. Another option for controlling a Parametric Sweep from the command line is to use a model method for reading the desired parameters from an input file. In the following example, the model method reads the input file and extracts the parameter names, the parameter values, and the parameter units. I use parametric sweep for this, but when I run the sweep it messes up my geometry and the study cannot be done. The target of the link above changed since I made the posting above. Due to the geometry being randomly generated, I get different errors in different spots each time, but I’ll paste a few of the errors below. This video uses a parametric sweep (created in a previous video, Performing a Parametric Sweep Study in COMSOL Multiphysics ®) to detail the ways in which tables can be used in simulations that give multiple results. The Parametric Sweep feature in COMSOL Multiphysics® is used to run a parametric study with several parameter cases in a single instance of COMSOL Multiphysics®. The parameter cases are typically handled one after the other and all compute resources (processes and cores) assigned to the single COMSOL Multiphysics® instance are used. Note: This discussion is about an older version of the COMSOL Multiphysics ® software. The Parametric Sweep feature in COMSOL Multiphysics® is used to run a parametric study with several parameter cases in a single instance of COMSOL Multiphysics®. Which doesn't make sense because my model is transient and moving with time (as I can see from postprocessing). Running parametric sweeps, batch sweeps, and cluster sweeps from the command line Solution Number: 1250 Versions: All versions. sweep parameters can only be monotonously increasing, or decreasing, only limitation, For your case you need a double nested parametric sweep, and that is not yet very well implemented in v4.0, works almost OK in 4.1 ;) Check the doc--Good luck Ivar The parametric solutions for all parameters are available in the output file (from a batch run) or in the GUI (for an interactive distributed COMSOL instance). The Batch Sweep — in contrast to the Parametric Sweep — is using multiple COMSOL batch instances to process the parameter cases. See … COMSOL behaves differently depending on how you define a parametric sweep. The UME x axis parametric sweep can be nested inside of another parametric sweep in COMSOL, controlling the UME's z direction movement. COMSOL BV Röntgenlaan 37 ... For example, the table can include the results from a nested parametric sweep with two independent parameters. The program then treats the parametric sweeps as a “nested for-loop” and indicates the nested structure using indentations of the sweep nodes’ names. And if I run a parametric sweep and put the expression "vt" in the "Global variables to evaluate" box then my output file will just report a bunch of zero values.