Line gragh along a cross section shape
Hi I have a cylinderical model. As you know if a cut plane is defined (no parallel with the base plan) cuts the cylinder, we will have an elliptical shape cross section in the boundaries. How I can...
View Article8 points of monitoring the temperatures - how to export to a dat file in one...
Good afternoon, I'm going to make a simulation where I need to export to a file. DAT (or .TXT), eight points for monitoring of temperatures, plus the time step. How to do this? I can only export only...
View ArticleTorque from Shear Stress Integration
Hello, I have been working on a model of a flat plate very near the wall of a duct with air flowing through it. In order to find the forces acting on this plate, I have been integrating T_stress over...
View ArticleTrouble coupling heat transfer physics for both fluids and solids
Hey all, So I'm getting stuck with my model where I try to couple three different physics. The three physics are: Electric Currents, Heat transfer in Solids, and Heat transfer in Fluids. Basically what...
View ArticleSimulation of Stirling Engine
Hello everybody I'm currently trying to simulate the fluid flow in a stirling engine (beta) which I've built from the following video:www.youtube.com/watch?v=X2qssmxA82U You should try building it;-)...
View Articleapplying reaction force operator on an inner boundary
Hello, I'm trying to calculate normal mass and heat flux on an inner geometry boundary (no boundary condition is applied on the boundary) using the reacf() oprator (reacf(p) for mass and reacf(T) for...
View ArticleSolving a nonlinear PDE
Hello, I want to solve a PDE in which the coefficients of the time derivative, space derivative of dependent variable are functions of dependent variable itself. I have attached a pdf file stating the...
View ArticleHow to export deformed structure from COMSOL?
I simulated a MEMS module based structure in COMSOL. I obtained the deformed structure after doing the simulation. I want to export the deformed structure so that it can be used for further analysis in...
View ArticleSpecifying a demagnetization curve of a permanent magnet
Hi all, I use the magnetic fields interface (AC/DC module) to simulate a magnetic system with permanent magnets and soft iron parts. Currently I use the "remanent flux density" constitutive relation (B...
View Articlehow to make a triangle in comsol 3.5a
Dear users, Does anyone know how to make a triangle in comsol 3.5a. Any help will be highly regarded. thanks. Cecil
View Articlehorizontal stress only shows in the top layer
hi i'm simulating a road using the elastic model. the road has 3 layers (asphalt, foundation, soil) with different moduli. when I apply the loads of the wheels, I can clearly see how the vertical...
View Articlenonlinear kinematic hardening
Hi is there some possibility to define a non-linear kinematic hardening model like Frederick-Armstrong without building all mechanical equations out of the mathematical interface?
View ArticleWhich interface choose for fluid flow with heat transfer
Good day! I would like to ask for an advice. I wish to solve the following problem: I have a plate of a solid material with low thermal conductivity. There is a pipe with cold water inside the plate....
View ArticleWindowed integration of a far field pattern in RF module
Hi folks, In RF module, after I obtain the far field patter (RCS) of a scatter, I need to calculate the integral of the RCS at certain angle over its neighborhood and then plot the integration as a...
View ArticleStore part of solution for next run
Hi: I have 2D and 3D models of the same experiment which are in the same file. I would like to do two things: 1) Store the solution of the 3D run and store seperately the data from a "cutplane". 2) Use...
View ArticleApplying torque in COMSOL
I have created the drill string (pipes and joints interconnected alternatively 9 times) geometry in the XZ plane and defined the cylindrical co-ordinate system. Boundary load 10000 N is applied as...
View ArticleRe-build Thermoacoustics Module
Hey there, I am using the physics module to rebuild the 3 differential equations of the thermoacoustic module (please see attached). In the physics module I am using the coefficient form PDE (3D). In...
View ArticleDoubt with extrusion coupling
Dear all, I have been reading the documentation on extrusion coupling and the packed bed reactor example in which extrusion coupling is used. I have a couple of questions: 1) How to select the...
View ArticleImporting an Excel point XYZ elevation file into COMSOL for modeling ice flow
Hello, I have an microsoft excel spreadsheet that has 475 point locations with known latitude, longitude surface elevation, and depth of ice for each point on a valley glacier. I also have 40 locations...
View Articleconvergence problem
Hi, I am a newcomer to comsol. Here is my problem. I always meet too large convergence when I run the comsol. If i change something to fix convergence, the reaction rate will be very low and the model...
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