Comsol out of memory

comsol out of memory Posted 03. 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 am working on a project to do a coil simulation using COMSOL to determine inductance and resistance variations with frequency. The largest addressible memory in 32 bit is 2^32==4 GB. It might help you to sort out problems with domains if your exporting program is adding adding small faces or slivers to the geometry. Out of Memory If you receive the "Out of Memory" error, most likely the Java heap has an inadequate size. 5mm x 100nm cap on the middle of the film. These values were Young’s modulus = 3. 0. COMSOL Multiphysics (formerly FEMLAB) is a finite element analysis and solver software package for various physics and engineering applications, especially coupled phenomena, or multiphysics. It has been my experience that using this option slows down the solution process so much, that it is not worth it for me. 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. The PARDISO out-of-core solver stores the LU factors on the hard drive. opts file, which is located in the comsol bin directory to 512MB or higher . This minimizes the internal memory usage. You can specify the temporary directory where PARDISO stores . 4 0 Replies COMSOL help out of memory! Last Post; Feb 18, 2010; Replies 7 Views 13K. I'm using Comsol on my Macbook, so memory may be an issue. However, COMSOL software offers only plane strain, plane stress and solid stress-strain application mode for a contact model. Let’s find out how… Writing Out Data from a Model. #1. Posted 13 août 2020 à 05:46 UTC−7 Computational Fluid Dynamics (CFD) Version 5. Increasing the mesh size cause decreasing the amount of memory that is needed for simulation. The COMSOL discussion forum covers a wide variety of simulation topics. If your machine can't handle that kind of run, then as Topher mentioned, get some more RAM. The solution time and memory requirements are strongly related to the number of degrees of freedom in the model. two of the boundaries (which is a type of identity condition) and. 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 . If the default solver does not perform well, use the following guidelines to choose a linear system solver. Lastly, 160k elements is not a lot. 2) Check the size of your COMSOL model Open the file and modify it according to the instructions above. 2011 à 22:23 UTC−7 Mesh, Studies & Solvers Version 4. It used about 3. 7. The default Java heap size for Comsol is 2G. Discussion Closed This discussion was created more than 6 months ago and has been closed. If a job exhausts both the physical memory and the swap space on a node, it causes the node to crash. I have 32Gb of memory, and it will use more virtual memory than RAM when there are at least 25Gb of RAM unused. A new approach using a fluid model was tested in this work in COMSOL to simulate inductively coupled plasma . Forums. - Feature: Automatic Remeshing (sol2/t1/arDef) Cite . Even for "only" 8M nodes, the solvers ramp up the memory usage all the way up to 24GB, and then it starts swapping. Floating a cruise ship in a bucket of . 2013, 16:07 GMT-8 Studies & Solvers Version 4. owned and supported by COMSOL, Inc. 02. 2. 25 S/m Electrode width of 60μm Channel height of 18. Engineering. I remember 256MB is the default setting for this. See also: Knowledge Base 1186: Out of memory during assembly. The old our-of-memory problems disappeared, but it's easy to make them reappear again with a fine enough mesh. 3a Memory problem -- not using enough RAM. 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. I will try changing the drive to D:/ but I dont think that would help in improving computation time. 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. For example, I am running this program on 1 CPU with 8gb of RAM. Follow the guidance given in Knowledge Base 1030. Therefore, BiCGStab typically uses less memory than GMRES. COMSOL help out of memory! Last Post; Feb 18, 2010; Replies 7 Views 13K. I have a loop in my M-file. Posted 23-Aug-2019, 1:03 am GMT-4 Mechanical, General, Structural Mechanics & Thermal Stresses Version 5. × Warning Your internet explorer is in compatibility mode and may not be displaying the website correctly. 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. 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. 43 GMT-7 Computational Fluid Dynamics (CFD) Version 4. Hot Threads. Hit the refine-mesh enough times and eventually you run out of memory. Open the file and modify it according to the instructions above. Note: This discussion is about an older version of the COMSOL Multiphysics ® software. 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. With a parallel job, there may be many nodes that crash. [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. runs out of memory. 2) Check the size of your COMSOL model I am a new member in the COMSOL community. The versions currently available at OSC are: Version Owens 52a X 53a X 5. See also: Knowledge Base 1186: Out of memory during assembly The information provided may be out of date. And it seems that the memory usage of my program increases as the loop increases. cannot solve a bigger problem than the code will hold with 2GB. The out of memory problem might be due to the folder that you have chosen for your temporary and/or recovery files. In practice, there is a limit to how much mesh refinement can be done before you exceed the computational resources that you have available. Lars Gregersen April 8, 2016. 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. When you launch COMSOL, add the option -comsolinifile [path] to the COMSOL command, where [path] is the path to your new comsol. This step will almost always require more memory than the assembly step. (See also: Knowledgebase 1030: Error: "Out of memory". I drew my structure within Comsol. I am using Comsol with Matlab. . 6e10 Pa, Poisson’s ratio=. Out of memory in mesh . Obviously, I have to optimize the model. Do a search through the Comsol help to find that stuff. lang. I first put together a fairly simple 3D emag. Availability and Restrictions Versions COMSOL is available on the Owens clusters. 1 2 Replies Prthivirajan Velraju The information provided may be out of date. ini file. BiCGStab uses approximately the same amount of memory as GMRES uses for two iterations. So, even if you have a machine with more than 2GB (like your 4GB), you. 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. 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. COMSOL simulation utilized: All temperature dependent parameters, where σ 0 = 1. In the limit of mesh refinement, well-posed problems will be convergent. 2) Check the size of your COMSOL model Next, as mentioned you can typically allow swap files or other memory management tools. These are sometimes runtime options, or specified in an input file somewhere. For the out layer of the helmet there wasn’t a preset material in comsol. model without any coupling variables. 2) Check the size of your COMSOL model I'm using Comsol on my Macbook, so memory may be an issue. we supply many other resources to help you get the most out of COMSOL products. Hi. 4 X 5. Before adding the physics or materials, make sure your model meshes first. 5mm substrate under a 4mm x 4mm x 150nm thin film with a 0. 6μm A voltage of 3. 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. General Engineering. If that is the case you will need to defeature. Memory usage on a single-node computer with a direct solver for refinement factors r = 3 and r = 5. [ERROR] Computed plastic multiplier is negative - Bending of shape memory alloy wires. The price is longer solution times because it takes longer time to read and write to disk than using the internal memory. Convergence: u(0,0) diff. 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. 1. 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. " . 5 X . Try the MUMPS direct solver. 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. 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. 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. and that it is switching to out-of-core settings when you are refining the mesh because you do . Out of memory during LU . Windows and/or Linux 32-bit is limited to about 2GB problem size. limitation of memory. It is very simple: 3 rectangular blocks - (x,y,z) 4mm x 4mm x0. It is often desirable to be able to estimate the number of degrees of freedom based on the number of elements in the model. Let’s begin by writing some data out of our model to disk. COMSOL memory. , 19:07 GMT-5 Studies & Solvers . Liquids should be water and glycerol and I want to compare those results from air, which means empty. Check out the ‘real world example’ section of this article, which walks through a ‘java. Knowledge Base 1030: Error: "Out of memory" Solving: During the solving step, the software solves the set of equations that has been assembled. I would also suggest that drawing it in COMSOL is a good idea as well. 2013 г. 3. mar. 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. Out of Memory During Assembly Posted 29. I also tried to simulate this with four sheets of metal and three layers of Kapton. 4GB to solve. COMSOL requests memory from the operating system and will always use both the physical RAM and virtual memory available on your system. COMSOL makes every reasonable effort . Without seeing your script it is hard to guess what goes wrong. For me now it is at 38M nodes. For most physics interfaces each dependent variable is present in all nodes in the mesh. If you run out of memory during the assembly step, you do not have enough RAM memory in your computer to solve your model. The information provided may be out of date. 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. Browse the threads and share your ideas with the COMSOL community. 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. Out of memory during assembly. When a node crashes, the OSC staff has to manually reboot . I used a swept mesh. Im working on fsi , whit blood flow and time-dependent study. 40Ghz and 12. Try changing it to the D:/ drive in settings. I am trying to solve a simple 3D problem having diffusion and chemical reaction within the subdomain. Therefore, property values had to be inputted manually. 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. Nov 7, 2008. with the PARDISO solver. 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. It is a very intensive program, so after a while, the program stops because there is no more memory. " 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. 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. Two-Phase Flow Modeling Guidelines Solution Number: 1239 Applies to: CFD Module, Microfluidics Module Versions: All versions. I have been trying to simulate a complex structure and I have been running into out of memory for that. 5mm x 0. I would try to increase it by editing the MAXHEAP-value in the comsol. Hi Oscar. 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). A boundary load is applied to the front the helmet. 5 Memory problem -- with enough RAM about 512G. I then added periodic boundary conditions on. However, I am getting this message "out of memory during LU factorization. 9. With increasing the mesh size you can solve huge problems with less memory. I have a CAD file for the geometry but I need help because I am having serious difficulties with the rest. Memory is a major issue in 3D and it is also interessant to use an axisymmetric model. See also: Knowledge Base 1186: Out of memory during assembly 2. 5 3 Replies The direct solvers in COMSOL Multiphysics automatically use the distributed memory, leading to a memory reduction on each node. See also: Knowledge Base 1243: Out of memory Copy the comsol. its make this error: The following feature has encountered a problem: Failed to find consistent initial values. 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. 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. Out of Memory During Assembly Posted 29 mars 2012 à 05:43 UTC−4 Computational Fluid Dynamics (CFD) Version 4. memory requirments went up to about 4GB. 2) Check the size of your COMSOL model Comsol Matlab memory usage. Knowledge Base 1030: Error: "Out of memory". If the solver still runs out of memory or is too slow, use one of the iterative solvers GMRES, FGMRES, BiCGStab, or TFQMR. 2a 3 Replies Nitin Bothra Comsol 5. I have been asking for years how to fix the virtual memory issue in COMSOL. OutOfMemoryError: unable to create new native thread’ problem experienced a major B2B travel . One of our introduction tutorials for RF modeling involves an RF coil model. Let’s have a look at a copper coil made of two turns. Watch this archived webinar. 0 Go of RAM. . 3a 8 . 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 during . Comsol 5. Copy the comsol. The exponent is hard to see from the data, but the convergence is rapid. PARDISO also includes out-of-core capabilities. This model has several parameterized inputs to study as well as outputs to report. 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. 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 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. Aerospaztic. 32 and density = 1330kg/m^3. It won't. KNOWLEDGE BASE Out of Memory But the memory allocation for comsol, (at bottom of the window) remains around 2GB or something. I believe my computer should be powerful enough to do it : 2 * 2. 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. Posted 3 февр. 2a 3 Replies Nitin Bothra out of memory in stationary solver Posted 24 juil. The COMSOL contact modeling doesn’t yet support the axial Running COMSOL in Parallel 70 Shared-Memory Parallel COMSOL . 2012 02. 2a 3 Replies Nitin Bothra Maybe the maximum java heap size is the problem. The Domain Decomposition solver is an additional option that takes advantage of the parallelization based on the spatial subdomain decomposition. So, first thing to do to solve large problems is get a 64-bit machine. 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. labd0001. ini file to a folder where you have write permission. The direct solvers in COMSOL Multiphysics automatically use the distributed memory, leading to a memory reduction on each node. impacted memory usage. Solving: During the solving step, the software solves the set of equations that has been assembled. Get an introduction to high-performance computing and solving large models with COMSOL Multiphysics ® . Try the PARDISO direct solver. comsol out of memory