comsol out of memory Out of memory during Comsol 5. lang. owned and supported by COMSOL, Inc. I used a swept mesh. PARDISO also includes out-of-core capabilities. COMSOL simulation utilized: All temperature dependent parameters, where σ 0 = 1. 5 Memory problem -- with enough RAM about 512G. The PARDISO out-of-core solver stores the LU factors on the hard drive. 1201 69 -1132 231 162 234 3 231 -3 The order of convergence should be 2 for regular solutions in energy norm and 3 in max-norm. Discussion Closed This discussion was created more than 6 months ago and has been closed. 9. Floating a cruise ship in a bucket of Before adding the physics or materials, make sure your model meshes first. its make this error: The following feature has encountered a problem: Failed to find consistent initial values. It used about 3. General Engineering. 2) Check the size of your COMSOL model Comsol Matlab memory usage. #1. Hi Oscar. 3a 8 Copy the comsol. 3a Memory problem -- not using enough RAM. opts file, which is located in the comsol bin directory to 512MB or higher Also, remember that other parts of COMSOL need RAM to operate also, and MUMPS can't have all the in-core memory even if you gave it all of it. Comsol 4. Floating a cruise ship in a bucket of However, using virtual memory is slower than storing data in RAM, therefore the virtual memory will not, by default, be much greater than the installed RAM memory. Nov 7, 2008. The default Java heap size for Comsol is 2G. However, I am getting this message "out of memory during LU factorization. two of the boundaries (which is a type of identity condition) and. 5mm substrate under a 4mm x 4mm x 150nm thin film with a 0. labd0001. Also, remember that other parts of COMSOL need RAM to operate also, and MUMPS can't have all the in-core memory even if you gave it all of it. COMSOL requests memory from the operating system and will always use both the physical RAM and virtual memory available on your system. (See also: Knowledgebase 1030: Error: "Out of memory". FORUM zoom in/out with mouse wheel; BLOG How Much Memory Is Needed to Solve Large COMSOL Models? BLOG The Elephants of Materials Science: SMAs Never Forget Their Shape; FORUM "Out of memory when xmesh processing" and issue with allocating only a fraction of the available RAM. impacted memory usage. Convergence: u(0,0) diff. Out of Memory If you receive the "Out of Memory" error, most likely the Java heap has an inadequate size. With a parallel job, there may be many nodes that crash. I am trying to solve a simple 3D problem having diffusion and chemical reaction within the subdomain. Posted 3 февр. × Warning Your internet explorer is in compatibility mode and may not be displaying the website correctly. 2013 г. It is often desirable to be able to estimate the number of degrees of freedom based on the number of elements in the model. You can change the value by following three steps: 1) load the comsol module; ml Comsol/version 2) copy the Comsol setup file to your home directory Note: This discussion is about an older version of the COMSOL Multiphysics ® software. This step will almost always require more memory than the assembly step. I do have access to a cluster with 768 Gb of RAM which would not stumble in this problem (my WS has 16 Gb) but I can't seem to find any way to do this, which seems that should be quite easy to do. Forums. Posted 13 août 2020 à 05:46 UTC−7 Computational Fluid Dynamics (CFD) Version 5. 25 S/m Electrode width of 60μm Channel height of 18. Out of Memory During Assembly Posted 29 mars 2012 à 05:43 UTC−4 Computational Fluid Dynamics (CFD) Version 4. Lars Gregersen April 8, 2016. Out of memory in mesh The solution time and memory requirements are strongly related to the number of degrees of freedom in the model. I believe my computer should be powerful enough to do it : 2 * 2. we supply many other resources to help you get the most out of COMSOL products. COMSOL Multiphysics (formerly FEMLAB) is a finite element analysis and solver software package for various physics and engineering applications, especially coupled phenomena, or multiphysics. 4GB to solve. This model has several parameterized inputs to study as well as outputs to report. See also: Knowledge Base 1243: Out of memory Copy the comsol. The Domain Decomposition solver is an additional option that takes advantage of the parallelization based on the spatial subdomain decomposition. If a job exhausts both the physical memory and the swap space on a node, it causes the node to crash. 2. , 19:07 GMT-5 Studies & Solvers Out of Memory During Assembly Posted 29. It can calculate the capacitance just fine, but when I try to apply pressure on it, COMSOL either gives an out of memory error, or tells me my result is not convergent. Let’s have a look at a copper coil made of two turns. I then added periodic boundary conditions on. 6μm A voltage of 3. 40Ghz and 12. The information provided may be out of date. 02. " Is my computer running out of memory to solve this particular problem or should I use a better solver to solve this problem? So the point I am stuck right now is the finest mesh: The study with the fine mesh needs MUMPS to switch to "out of core" mode and allocate a lot of virtual memory. Hit the refine-mesh enough times and eventually you run out of memory. 1. Copy the comsol. However, using virtual memory is slower than storing data in RAM, therefore the virtual memory will not, by default, be much greater than the installed RAM memory. The versions currently available at OSC are: Version Owens 52a X 53a X 5. The exponent is hard to see from the data, but the convergence is rapid. The COMSOL Multiphysics (formerly FEMLAB) is a finite element analysis and solver software package for various physics and engineering applications, especially coupled phenomena, or multiphysics. The below example is that I followed for my goal since it's the first time dealing with this software so I need to follow the similar one. The required memory and the computational time for one iteration with BiCGStab is constant; that is, the time and memory requirements do not increase with the number of iterations as they do for GMRES. Even for "only" 8M nodes, the solvers ramp up the memory usage all the way up to 24GB, and then it starts swapping. In the limit of mesh refinement, well-posed problems will be convergent. The direct solvers in COMSOL Multiphysics automatically use the distributed memory, leading to a memory reduction on each node. Let’s begin by writing some data out of our model to disk. I have been asking for years how to fix the virtual memory issue in COMSOL. Availability and Restrictions Versions COMSOL is available on the Owens clusters. I would also suggest that drawing it in COMSOL is a good idea as well. 5 X For the out layer of the helmet there wasn’t a preset material in comsol. A boundary load is applied to the front the helmet. If you run out of memory during the assembly step, you do not have enough RAM memory in your computer to solve your model. " [COMSOL_Users] Navier stokes, and heat conduction' (newsgroups and mailing lists) 16 Note: This discussion is about an older version of the COMSOL Multiphysics ® software. Browse the threads and share your ideas with the COMSOL community. memory requirments went up to about 4GB. Check out the ‘real world example’ section of this article, which walks through a ‘java. In practice, there is a limit to how much mesh refinement can be done before you exceed the computational resources that you have available. Try the PARDISO direct solver. 2) Check the size of your COMSOL model Next, as mentioned you can typically allow swap files or other memory management tools. Posted 23-Aug-2019, 1:03 am GMT-4 Mechanical, General, Structural Mechanics & Thermal Stresses Version 5. Problem description A common problem on our systems is that a user's job causes a node out of memory or uses more than its allocated memory if the node is shared with other jobs. You can change the value by following three steps: 1) load the comsol module; ml Comsol/version 2) copy the Comsol setup file to your home directory This step will almost always require more memory than the assembly step. 43 GMT-7 Computational Fluid Dynamics (CFD) Version 4. Knowledge Base 1030: Error: "Out of memory" However, using virtual memory is slower than storing data in RAM, therefore the virtual memory will not, by default, be much greater than the installed RAM memory. Windows and/or Linux 32-bit is limited to about 2GB problem size. Memory is a major issue in 3D and it is also interessant to use an axisymmetric model. Watch this archived webinar. This minimizes the internal memory usage. Get an introduction to high-performance computing and solving large models with COMSOL Multiphysics ® . opts file, which is located in the comsol bin directory to 512MB or higher Out of memory during assembly. 0 Go of RAM. And it seems that the memory usage of my program increases as the loop increases. Knowledge Base 1030: Error: "Out of memory" Solving: During the solving step, the software solves the set of equations that has been assembled. mar. For me now it is at 38M nodes. [ERROR] Computed plastic multiplier is negative - Bending of shape memory alloy wires. I also tried to simulate this with four sheets of metal and three layers of Kapton. If the solver still runs out of memory or is too slow, use one of the iterative solvers GMRES, FGMRES, BiCGStab, or TFQMR. You can specify the temporary directory where PARDISO stores Using a fine mesh may lead to running out of memory, but the method suggested by the presenters will not require more memory than any other method to study the effect of the mesh size. If your machine can't handle that kind of run, then as Topher mentioned, get some more RAM. Try changing it to the D:/ drive in settings. 4 0 Replies COMSOL help out of memory! Last Post; Feb 18, 2010; Replies 7 Views 13K. Despite the performance penalty, the Domain Decomposition solver with the Recompute and Clear option is a viable alternative to the out-of-core option for the direct solvers when there is insufficient memory. I first put together a fairly simple 3D emag. If the default solver does not perform well, use the following guidelines to choose a linear system solver. KNOWLEDGE BASE Out of Memory But the memory allocation for comsol, (at bottom of the window) remains around 2GB or something. COMSOL makes every reasonable effort This step will almost always require more memory than the assembly step. OutOfMemoryError: unable to create new native thread’ problem experienced a major B2B travel COMSOL memory. I have been trying to simulate a complex structure and I have been running into out of memory for that. - Feature: Automatic Remeshing (sol2/t1/arDef) Cite A new approach using a fluid model was tested in this work in COMSOL to simulate inductively coupled plasma PARDISO also includes out-of-core capabilities. ini file. 2a 3 Replies Nitin Bothra out of memory in stationary solver Posted 24 juil. These are sometimes runtime options, or specified in an input file somewhere. One of our introduction tutorials for RF modeling involves an RF coil model. The COMSOL contact modeling doesn’t yet support the axial Running COMSOL in Parallel 70 Shared-Memory Parallel COMSOL . 1 2 Replies Prthivirajan Velraju The information provided may be out of date. Therefore, BiCGStab typically uses less memory than GMRES. BiCGStab uses approximately the same amount of memory as GMRES uses for two iterations. I remember 256MB is the default setting for this. I have a 250GB SSD in my PC - the root directory (where Comsol is installed and the virtual memory is used) has now 20GB free space, which is not enough for the calculation. The price is longer solution times because it takes longer time to read and write to disk than using the internal memory. See also: Knowledge Base 1186: Out of memory during assembly The information provided may be out of date. However, COMSOL software offers only plane strain, plane stress and solid stress-strain application mode for a contact model. Do a search through the Comsol help to find that stuff. 0. There is no other way for decreasing the amount of memory that you need for simulation; because you don't write any program and all things done automatically in COMSOL. So, first thing to do to solve large problems is get a 64-bit machine. It has been my experience that using this option slows down the solution process so much, that it is not worth it for me. Does anyone have a fix for this? I have been trying to simulate a complex structure and I have been running into out of memory for that. 32 and density = 1330kg/m^3. 2011 à 22:23 UTC−7 Mesh, Studies & Solvers Version 4. runs out of memory. Solving: During the solving step, the software solves the set of equations that has been assembled. 7. 3. Try the MUMPS direct solver. The general question of how much memory is needed for solving large models is discussed in this blog post: The solution time and memory requirements are strongly related to the number of degrees of freedom in the model. When a node crashes, the OSC staff has to manually reboot The old our-of-memory problems disappeared, but it's easy to make them reappear again with a fine enough mesh. I have 32Gb of memory, and it will use more virtual memory than RAM when there are at least 25Gb of RAM unused. 2) Check the size of your COMSOL model Open the file and modify it according to the instructions above. I would try to increase it by editing the MAXHEAP-value in the comsol. 2) Check the size of your COMSOL model I'm using Comsol on my Macbook, so memory may be an issue. I have a loop in my M-file. 5mm x 100nm cap on the middle of the film. 5mm x 0. 2013, 16:07 GMT-8 Studies & Solvers Version 4. Aerospaztic. COMSOL memory. 3a 8 Increasing the mesh size cause decreasing the amount of memory that is needed for simulation. ini file to a folder where you have write permission. Follow the guidance given in Knowledge Base 1030. 5 X I'm using Comsol on my Macbook, so memory may be an issue. Memory usage on a single-node computer with a direct solver for refinement factors r = 3 and r = 5. model without any coupling variables. For example, I am running this program on 1 CPU with 8gb of RAM. However, using virtual memory is slower than storing data in RAM, therefore the virtual memory will not, by default, be much greater than the installed RAM memory. I drew my structure within Comsol. My model includes Two-Phase Flow, Level Set or the Two-Phase Flow, Phase Field interface and it is either not converging, taking a very long time to solve, or not converging to a reasonable result. With increasing the mesh size you can solve huge problems with less memory. Engineering. You can specify the temporary directory where PARDISO stores The old our-of-memory problems disappeared, but it's easy to make them reappear again with a fine enough mesh. Using a fine mesh may lead to running out of memory, but the method suggested by the presenters will not require more memory than any other method to study the effect of the mesh size. It won't. For most physics interfaces each dependent variable is present in all nodes in the mesh. and that it is switching to out-of-core settings when you are refining the mesh because you do One of the most common questions we get is: How large of a model can you solve in COMSOL Multiphysics? It turns out that this is quite tricky to answer decisively, so in this blog entry, we will talk about memory requirements, model size, and how you can predict the amount of memory you will need for solving large 3D finite element problems. with the PARDISO solver. The out of memory problem might be due to the folder that you have chosen for your temporary and/or recovery files. Using COMSOL Multiphysics and the RF Module, we can analyze the signal strength of an RF coil by solving for its resonance frequency and Q factor, among other properties. . Let’s find out how… Writing Out Data from a Model. When you launch COMSOL, add the option -comsolinifile [path] to the COMSOL command, where [path] is the path to your new comsol. I have a CAD file for the geometry but I need help because I am having serious difficulties with the rest. See also: Knowledge Base 1186: Out of memory during assembly. Without seeing your script it is hard to guess what goes wrong. Open the file and modify it according to the instructions above. It is quite easy to run out of memory when you are creating a large model using a script since you can easily create thousands of geometric objects, physics and settings, which all take up memory, of course. These values were Young’s modulus = 3. 2a 3 Replies Nitin Bothra Comsol 5. COMSOL makes every reasonable effort The computer then runs "Out of memory" (also by starting from a Finer mesh and then increasing the maxi/mini elements size and the resolution of narrow regions). It might help you to sort out problems with domains if your exporting program is adding adding small faces or slivers to the geometry. I will try changing the drive to D:/ but I dont think that would help in improving computation time. One of the most common questions we get is: How large of a model can you solve in COMSOL Multiphysics? It turns out that this is quite tricky to answer decisively, so in this blog entry, we will talk about memory requirements, model size, and how you can predict the amount of memory you will need for solving large 3D finite element problems. Out of memory in mesh Two-Phase Flow Modeling Guidelines Solution Number: 1239 Applies to: CFD Module, Microfluidics Module Versions: All versions. The general question of how much memory is needed for solving large models is discussed in this blog post: Maybe the maximum java heap size is the problem. See also: Knowledge Base 1243: Out of memory When you launch COMSOL, add the option -comsolinifile [path] to the COMSOL command, where [path] is the path to your new comsol. Im working on fsi , whit blood flow and time-dependent study. Hi. Hot Threads. Lastly, 160k elements is not a lot. I am using Comsol with Matlab. cannot solve a bigger problem than the code will hold with 2GB. 6e10 Pa, Poisson’s ratio=. The COMSOL discussion forum covers a wide variety of simulation topics. I am working on a project to do a coil simulation using COMSOL to determine inductance and resistance variations with frequency. Therefore, property values had to be inputted manually. 5 3 Replies I am trying to find out the change of resonant frequency of QCM by changing the liquid on the top of QCM. 4 X 5. It is a very intensive program, so after a while, the program stops because there is no more memory. limitation of memory. Knowledge Base 1030: Error: "Out of memory". Obviously, I have to optimize the model. 2012 02. COMSOL help out of memory! Last Post; Feb 18, 2010; Replies 7 Views 13K. Liquids should be water and glycerol and I want to compare those results from air, which means empty. 接下来，检查模型的自由度 (dof) 数。当您开始求解问题时，comsol gui 的消息窗口将报告此信息。知识库 875 描述了如何基于网格近似预测自由度数。自由度数与 Note: This discussion is about an older version of the COMSOL Multiphysics ® software. The COMSOL contact modeling doesn’t yet support the axial comsol 向操作系统请求内存，并总是使用系统上可用的物理内存和虚拟内存。 2) 检查 comsol 模型的大小. Note: This discussion is about an older version of the COMSOL Multiphysics ® software. The largest addressible memory in 32 bit is 2^32==4 GB. To put this workflow into context, let’s look at a tutorial model of a busbar, which we use in our introduction to the COMSOL® software. It is very simple: 3 rectangular blocks - (x,y,z) 4mm x 4mm x0. 5 3 Replies The direct solvers in COMSOL Multiphysics automatically use the distributed memory, leading to a memory reduction on each node. 2) Check the size of your COMSOL model I am a new member in the COMSOL community. So, even if you have a machine with more than 2GB (like your 4GB), you. Posted 03. If that is the case you will need to defeature. 2a 3 Replies Nitin Bothra Maybe the maximum java heap size is the problem. . 5Vrms, as approximately measured by the oscilloscope with 12V on the function generator n PBS (T) from experimental work, z=z avg =5μm, and a line at x=+10μm away Out_of_memory_LU_factorization Last time step is not converged. Out of memory during LU impacted memory usage. See also: Knowledge Base 1186: Out of memory during assembly 2. comsol out of memory

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