Vibrational mode attribution to appropriate elements of a complex object
I have a physical object which is made out of several parts. Let's call them part A and part B. Each of its parts produce a set of vibrational eigenmodes, set-A & set-B of frequencies. When the...
View ArticleProblem with convergence
Hello everyone I work with the phase change materiels so i have a multiphysics problem with heat transfer and laminar flow. I have to examined the phase change with time dependence study...
View ArticleChange location of Comsols virtual memory (out-of-core file)
Dear community,I am currently trying to compare different mesh qualities and how the mesh affects the solution of the problem. So the point I am stuck right now is the finest mesh: The study with the...
View ArticleConditional and time dependent boundary condition
Hi,I would like to simulate a sea level increase as boundary condition. Initially, I simulated the problem with a constant pressure in order to have the initial condition. To this end, I defined the...
View ArticleAtmospheric Pressure Corona Discharge in Air
Hello everybody,I have a problem with the tutorial "Atmospheric Pressure Corona Discharge in Air". The highvoltage potential is -45kV at the inner cathode. When I change the highvoltage potential to...
View ArticleFiber Simulater of 3D
Hello everyone: I use Comsol for a little time, and recently, I'm interested in wave optics. I have finished the calculate of a 2D fiber. But I'm facing some problems about how to creat a 3D mode. I'm...
View ArticleHow to rotate a 2D plot made based a general type plane
Hi,I build a 3D model with which I want to make a vertical plane and it is not parallel to x or y axis, so I made this plane with three points using general plane type. However, the 2D plots made with...
View ArticleEigenfrequency NaN Error
I am doing eigenfrequency analysis with periodic boundary conditions.Even if I ask for 16 eigenfrequencies, in point evaluation I get 17 with 17th one as NaN. Why is that?I tried everything from...
View ArticleConstraints to deformation
Hello, I am simulating a 3D FSI model of an aortic valve inside a fluid domain. The valve consist of 3 leaflets which deform symmetricaly but i am simulating only the one of them. Since normally the...
View ArticleBinding and breaking energy
Hello, please, how to make a modeling and simulation of breaking energies on hydrogen bonds of a composite material? thank you
View ArticleError: Solution number out of range
Hi,I am trying to do a 2D parametric sweep in COMSOL. I did it many times recently, but today COMSOL shows up an error which said "Solution number out of range" while trying to extract the data in the...
View ArticleEffective mode index in Mode Analysis.
Hey~ guys.I have some question about a Effective mode index of mode analysis.Question1) In the thesis paper, it indicated "Neff =2.9444", But, when I tried to simulate on the same condition,, It...
View ArticlePressure Distribution Output in a Turbulent Flow Study
Hello,I am running a Turbulent Flow Study 2D and 3D on the S1223 Airfoil wing and have meshed and outputted resultant lift and drag forces using the spf stress command in the x and y directions.Is...
View ArticlePostprocessing (Antenna simulation)
Hello all,How can I show the current density on my antenna surface?Regards
View ArticleAnisotropic-rotation of compliance matrix-solid mechanics
Dear all,I am running a linear anisotropic model in 3D using solid mechanics module (Please find the geometry and boundary conditions in the attached photo). I would like to rotate the compliance...
View ArticleUnable to calculate Transmitted Power Ratio
Hi,I have the attached 3D waveoptics model. I want to calculate the transmitted power on a surface having specified incident power as 1[W] through the port.However, I am getting output power even as...
View ArticleSimulating strain in a semiconductor bonded to a piezoelectric material
Hi,I'm having trouble setting up a simulation where I have a III-V semiconductor membrane bonded to a piezoelectric material which is subjected to an electric field. I have the structural mechanics and...
View ArticleFlow past sphere
Hi all, I am trying to model Stokes flow past a sphere and calculate the drag force on the sphere. I get the right type of streamlines in COMSOL however I am facing challenges in getting the drag force...
View ArticlePML creation in Time-Dependent.
hi, I am trying to build a PML in time -dependent, I know that i can't use PML built in Comsol, so that's try i am trying to build one based of the formulas, It is useful to use Damping and impliment...
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