Discussion closed this discussion was created more than 6 months ago and has been closed. The comsol discussion forum covers a wide variety of simulation topics. New smoothed aggregation algebraic multigrid amg solver a new stateoftheart algebraic multigrid solver amg, the smoothed aggregation amg solver, can be useful for a wide range of applications. Computing software options available for researchers psu icds. The stationary solver takes seconds and looks very sensible.
Comsol will automatically detect the physics being solved as well as the problem size, and choose the solver direct or iterative for that case. Computing software options available for researchers psu. The following list contains the most important improvements in comsol version 5. Most software packages are added and removed from your environment using environment modules e. Sep 26, 2011 the stationary solver takes seconds and looks very sensible. Its comsol multiphysics product is an integrated software environment for creating physicsbased models and simulation applications. Or much easier, remove the current solver sequence right click on solver 1, and rebuilt default solver. I am simulating a timedependent problem with very different successive physics in comsol. This might be a question better suited for the software recommendations side of s. There are also many new functions and additions to the comsol product suite. Adding a study to your simulation is necessary in order to solve your problem. Comsol requires that every type of simulation included in the package has the ability to be combined with any other. Aug 18, 2016 one potential reason for this is that your mesh is using too many elements. You can either go to segregated step 1, and add mod1.
The software will automatically select the segregated approach in many cases, especially 3d models. Then, rightclick on the segregated feature and add at least two segregated steps and select the variables that correspond to the physics that you want to solve within that step. The functionality can be used to simplify your model, among other things, which we discuss in the video series. Jan 02, 2018 the mesh used for a geometry plays a significant role in how a model is computed. Engineering software solution for thermal elastohydrodynamic. In this blog post, we take a closer look at this capability. These forces generate some displacements in the structure but then i want to solve an eigen value or frequency responce sweep analysis to see how this deformations caused by the static force change the resonance frequency of the structure.
In the structural mechanics module, i have a structure under some static forces. Please enter integer sequence separated by spaces or commas. This means that the comsol license server needs to be upgraded to comsol 5. The solver sequence now shows the storage format that will be used when running on a cluster. How to use job sequences to save data after solving your model. Comsol makes every reasonable effort to verify the information you. Check out all of the rendering and visualization updates. Please login with a confirmed email address before reporting spam hi.
In the comsol multiphysics software, you can have the software automatically create a mesh or manually build a. For linear problems also solved in the steps of the nonlinear solver, see above, the comsol software provides direct and iterative solvers. Analysis software such as comsol multiphysics supports the gmg method. This is done through using a work plane along with the cross section geometry operation. To set up the fully coupled approach, rightclick on the stationary solver or the timedependent solver feature and select segregated to add a new segregated feature. A problem has been fixed where a running comsol instance could lose contact to the license server if the license file was changed on the license server. Efficiently mesh your model geometry with meshing sequences. In the comsol multiphysics software, this step of the modeling workflow is made efficient by using the available. The comsol multiphysics software also contains a tool for converting a 3d geometry into a 2d geometry. In addition to the software required for the icdsaci system to function e.
Comsol multiphysics is a finite element analysis, solver and simulation software fea software package for various physics and engineering applications, especially coupled phenomena, or multiphysics. Also, some software packages have specific instructions that are necessary to follow. How to build a mesh in comsol multiphysics youtube. Then its better to make a new solver sequence, or to reset the solver sequence. If theres something i can do in comsol to save the model without the requirement for acdc then let me know and ill repost it. Model setup is quick, thanks to a number of predefined physics interfaces for applications ranging from fluid flow and heat transfer to structural mechanics and electromagnetic. Your model uses a segregated solver, which does not include all the components which you want to solve for. The complexity of thermal elastohydrodynamic lubrication tehl problems has led to a variety of specialised numerical approaches ranging from finite difference based direct and inverse iterative methods such as multilevel multiintegration solvers, via differential deflection methods, to finite element based fullsystem approaches. Basic geometric multigrid concept the gmg algorithm jumps between. Comsol multiphysics software understand, predict, and. The mesh used for a geometry plays a significant role in how a model is computed. Comsol multiphysics is a crossplatform finite element analysis, solver and multiphysics simulation software.
Several performance optimizations have been implemented. Hence, not only knowledge of the physical and technical. The default option for a solution node in a sequence is to run all solution nodes. Comsol multiphysics software understand, predict, and optimize. The final mesh is the result of building all the operations in the meshing sequence. Another option, geometry, builds the geometry node. Jan 26, 2018 adding a study to your simulation is necessary in order to solve your problem. Basically under the study tree, i selected the first in the list, disables the others, attached the first sequence and run it, the i enabled the second solution and disabled the others, active sequence 2 etc. The direct solvers can be used for small and midrangesized problems, while the iterative solvers can be used for larger linear. Comsol notes that you are messing with the default solver settings, therefore if you later update the physics, comsol will not update the solver settings automatically, since once you edit them comsol considers you will continue to edit them at best. To create models for use in specialized application. The comsol gui includes a set of computerassisted design cad tools for geometry modeling in 1d, 2d, and 3d, but in most engineering cases, it is more efficient to import surface files from existing 3d solid models or create new geometry using the more sophisticated tools available in your companys 3d solid modeling software of choice. A new stateoftheart algebraic multigrid solver amg, the smoothed aggregation amg solver, can be useful for a wide range of applications.
Support for running comsol on the amazon elastic compute cloud amazon ec2. The default iterative solvers are chosen for the highest degree of robustness and lowest memory usage, and do not require any interactions from the user to set them up. Feb 14, 2017 comsol multiphysics is a finite element analysis, solver and simulation software fea software package for various physics and engineering applications, especially coupled phenomena, or multiphysics. You will experience speedup by a factor of up to ten in software responsiveness, as well as new and improved features for solving, meshing, and the physicsbased addon modules. Reset solver to default a new option resets the solver nodes in all attached. It allows conventional physicsbased user interfaces and coupled systems of partial differential equations pdes.
Certain characteristics of comsol become apparent with use. This will create a new and correct solver sequence. Comsol was established in july, 1986 with a headquarters in stockholm, sweden. The version of lmgrd must be the same or higher than the flexnet version used by the comsol software. Each meshing operation is added to the meshing sequence. The way to do this is to solve your initial model, then go back to study 1. If you now rightclick study 1, and press show default solver, then a new solver sequence is built solver 2. Jun 21, 2017 job refers to another sequence that is to be run from this sequence, while solution runs a solution node as available under the solver configurations node, available further up in the study tree. Basic geometric multigrid concept the gmg algorithm jumps between different linear systems representing coarser and finer. Improved data set and solver sequence naming for easier identification of which solver configurations data a data set refers to. The founders were former doctoral students of professor germund dahlquist at kth and originally partnered with us based mathworks as a european distributor of matlab. Sequence solver by alteredqualia find the next number in the sequence using difference table. How to add a study to your simulation in comsol multiphysics.
All comsol software products undergo stability improvements that are introduced as updates. One potential reason for this is that your mesh is using too many elements. When applicable, each study step includes options to compute to selected, compute selected step, and compute from selected for easier testing and debugging of large models with several study steps. The solution data structures are available as child nodes, together with other nodes, under solver configurations. I am looking for a free not only as in freedom alternative to comsol multiphysics. Learn more about this and other updates to the comsol desktop below performance improvements. New smoothed aggregation algebraic multigrid amg solver. In the comsol multiphysics software, this step of the modeling workflow is ma. Creating a model geometry in comsol multiphysics comsol blog. Nov 11, 20 comsol will automatically detect the physics being solved as well as the problem size, and choose the solver direct or iterative for that case. Ive not tried to get the time dependent solver to do something with a sudden step in the input, the 0s condition should be exactly the same as the stationary.
Meaning of segregated solver steps do not involve all. Eigenvalues from different study steps comsol multiphysics. I have a multiphysics problem in comsol involving the laplace equation, navier stokes equations and heat transfer. Littleknown functionality of the study node is its ability to perform a programmatic sequence of operations, including solving.
Rightclick on this feature and select fully coupled and a new fully coupled feature will appear in the solver sequence, and the segregated solver will become greyed out. Under other, you can choose external class, which calls an external java class file. The comsol multiphysics engineering simulation software environment facilitates all steps in the modeling process. Comsol provides an ide and unified workflow for electrical, mechanical, fluid, acoustics and chemical applications.
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