S-Parameter in Complex format in COMSOL
I have not yet been able to find how COMSOL represent complex format of S-parameters. Can anybody please provide the correct format with reference? I am wondering if it is like S11=Re(S11)+j*Im(S11) or...
View ArticleIs the problem positive definite? Floquet periodic boundary conditions or PML...
Hello, I am doing some elastic wave simulations using solid mechanics module and piezoelectric module. And sometimes the DOF of my models are quite large so that I have to choose the solver manually to...
View Articlepartial derivative of external MATLAB function
Hi, I am modeling reactive transport in COMSOL and have external MATLAB function to solve the chemical reactions. MATLAB function is defined based on five COMSOL variables as follows; FUNCTION NAME:...
View ArticleNew "Introduction to Multiphysics" book
Hello, We are pleased to announce that a new version of the "Introduction to Multiphysics" book is now available for immediate download...
View ArticleNew "Introduction to Multiphysics" book
Hello, We are pleased to announce that a new version of the "Introduction to Multiphysics" book is now available for immediate download...
View ArticleUsing the Optimization Module for geometry examination
Geometry optiization 4.3a Simple 1D sold state battery problem (in COMSOL) Done with assistance from COMSOL M = length of anode 320 nm L = length of solid electrolyte 1500 nm objective function =...
View Articlevoltage at different coordinates
Hello every one. it is possible in COMSOL to fine the voltage at (x,y,z) coordinates? thank you
View ArticleUndefined value found.
I am using poroelasticity module to simulate soil behavior of porous materials, the error information is as follows: Undefined value found. - Detail: Undefined value found in the stiffness matrix....
View ArticleInlet Boundary velocity
Inlet boundary velocity profile = 4*s*(1-s)*Umax What is actually represent this equation? What is s? What is the different between normal velocity and Umax?
View Articleimporting a 3D gegmented image as a geometry
Hello everyone, I am trying to import a 3D segmented image into the COMSOL as a geometry. Is it possible? Actually, after testing a bunch of softwares and doing some tricky things I finally succeeded...
View ArticleAdding temperature varying with time
I want to enter temperature for calculating heat flux (temperature varies with time). Is there any method of entering the values? How can I use functions like interpolation, Rectangular etc,,,
View ArticleHow to determine face numbers (using matlab livelink) associated with an object
Hello again, I am trying to 'automatically' set my boundary conditions for a model generated in matlab with livelink. I know which objects need to have which boundary conditions based on a draw order...
View ArticleJoule Heating - Study help
Hello all, I am currently working on modeling the thermal stresses of a surface mounted component on a PCB. However, i am currently struggling to get the physics to work. I have followed the available...
View ArticleWhy my perspective view is like!?(Please help me!!!!!!)
Hey guys! I install the program & run it, but the perspective view is like(picture is attached). how to Repair or fix it? please help!!!!
View ArticleComsol on HPC server
I have just set up Comsol on a 48 processor machine using HPC server it is one machine with no cluster. It is running extremely slow. When using all 48 processors it takes over 137 seconds to process...
View ArticlePoint Charge
Hello all I want to define point charges (lets say some circles as positive Or negative charges) in Comsol. Can anybody give me some idea how i can do this? what I have in my mind is: define a constant...
View Articlewhere can I find the user guide for "Heat transfer module" and "joule heating...
Hi guys, just wondering where can I get the user guide of "Heat transfer module" and "joule heating module"? Electronic files will be better. I do have it for v 3.5, but as the software upgraded to...
View ArticleParticle tracing - particle counting
Hello to everyone, Im new to COMSOL and currently trying to work with particle tracing for fluid flow. The model we are working on is part of vascular network and we are using as physics : structural...
View ArticleError: Parameter lists gives empty sweep
Hello, I would like to know the reasoning behind this error in return of a monotonously incresing series of frequencies. Examples: a) 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 90,...
View ArticleProperties of magnetic flux in some transformer sheets
Hello everyone, i´m trying to observe the magnetic flux density in a smal gap of some transformer sheets. So far building the model and getting results that are in consent with my experimental setup...
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