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Stiffness in bending mode

Hello Everyone, I have been COMSOL for quite sometime and have come across a problem that I can not solve very recently. My objective is to find out the bending stiffness of a metallic nanoplate. What...

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Effect of tension on eigenfrequency

Hi, I'm trying to model the effect of tension on the eigenfrequency, and I think I'm misunderstanding the use of boundary loads. I have a long and narrow bridge (fixed at both ends, free along the...

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Change x-axis units in table plot

Hi all, I have a 3d model of diffusion from a source and am calculating surface integrals of flux over particular features in my geometry. This outputs a table of total flux vs. time point which can...

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How to integrate a table result

Hello, I have calculated surface integrals for total flux over particular features in my geometry. This outputs a table of total flux in (mol/s) vs. time points. I would like to then be able to...

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parasitic capacitance

hi, i m designing a capacitive comb drive accelerometer in this i want to take parasitic capacitance in to account in order to find capacitance but i cant find where it is...could you please help me out

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difference between "optimization study node" and "optimization module" for an...

Hi! Seems an optimization problem can be performed by either "optimization study node" or "optimization module". If use "optimization study node", the available optimization solvers include SNOPT and...

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mesh error

Hey, I was trying to follow the PDF on comsol website ( Model ID 15) to build a model for Helmholtz coil. I followed almost all the steps except for the dimensions, so the geometry should have no...

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Gain Medium with Circularly polarized light in COMSOL

Dear All COMSOL follows exp(-iwt) modeling in the and hence the absorption of the material is given by imag(permittivity) >0. If I want to simulate a gain medium, is it trivial to replace the...

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Sharp Fluid-Fluid Interface

I’m new to COMSOL, and I was hoping someone here would be able to help me. I am trying to model fluid displacement in a pipe. I could use the two-phase flow module, but I don’t need that level of...

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try/catch in matlab for COMSOL

I am doing a parametric sweep in COMSOL with the geometry. The problem is, it is a large parameter space and a few combinations which would be unreasonable to check give an error. It is a stationary...

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Can I use COMSOL to solve integral equations?

Dear all, I have some integral equation to solve. Can I do that with COMSOL or I always need to change it to PDE? Thanks a lot!

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give specific values for every mesh point of a boundary as boundary condition

hey everybody, is it possibly to give different values for all points of the mesh on the boundary, respectively? for example, just a vector containing as many values as i have boundary mesh points, or...

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Please send me tutorial for ultrasonic wave propogation through liquid

I need tutorial on Ultrasonic wave propogation through liquid.

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Modeling a Sliding Constraint

I am trying to model a sliding constraint, basically a pin in a hole. To try to understand how best to apply the contraints I created a simple model of a tube and rod. The tube and rode are both 1 m...

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Show parameteric value on plot

I've made a model of a hi-pot test setup to visualize how the electric field changes at a discontinuity as the conductivity changes (fixed potential). I'ts working great, but now I want to make an...

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Hyperelastic anisotropic material modeling problem

I have a hyperelastic anisotropic modeling problem. There is a swelling for the the body. That is to say, the determinant of the deformation gradient equals a fixed constant other than 1. Does anyone...

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Easy way to convert a complex solid model to shell model

I am working with a complex structure with formed sheet metal and tubes. Wall thickness of ~.030" with linear dimensions on the scale of 8 to 15". Definitely a problem that would benifit from a shell...

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Inaccuracies in the formulas of the Materials Browser

Let's work with Structural Mechanics Module> Thermal stress. The temperature at which there is no change in size of your model, called Tref. L (T) - the size of your model at a temperature T. To...

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Anchor loss in resonators

Hi If I want to evaluate Q of a vibrating resonator due to anchor loss using PML, is it necessary to have the acoustic module? or, I can use the structural mechanics/MEMS module for that?

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piezoelectric potential due to a deformation

hi, an electric potential applied to a piezoelectric material will cause a deformation of the material. On the other hand a deformation of a piezoelectric material will end up in an electric potential....

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