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co-efficient of thermal expansion
Hello evrybody, Can anyone help me to know if I can input my co-efficient of thermal expansion as a function of Stress and Temperature or not. And if possible how to do that. Thank you.
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Output pressure of the transducer adding Vac + Vdc
hello, I 'm working on a capacitive transducer, using the electromechanics(emi) model. Now I want to observe the output pressure of the transducer in the frequency domain and I add a voltage V=Vac+50...
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Resonance frequency of beam (calculation+plot)
HI I want to calculate and plot resonance frequency of cantilever that I designed in MEMS module. Based on the previous discussions here I understand that I should do the study in "Eigenfrequency" and...
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Absorbing boundary condition for transient wave propagation problem
Hi! I am wondering if I can define an absorbing boundary condition for a transient ultrasonic wave propagation problem (let's say in a 2D plane strain transient module). The option certainly doesn't...
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Cannot select geometry in physics section
Hi, I have a problem with a Fresnel lens like structure, I created by combining parametric curves and Bezier segments. After drawing and merging the lines, I revolved the working plane and got the...
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How to plot or evaluate the norm of any value?
How do I plot or evaluate the norm of any value? Especially, I like to plot the norm of the x, y and z component of the magnetic flux density! Is there a predefined operator, for example norm(mf.Bx) or...
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Running FSI examples, "undefined value found"
Hi!, i am trying to run an fluid-structure example with use of the MEMS module, byt anytime i get the error "undefined value found..." for the variable mod1.v_solid. So i even downloaded the 2d fsi...
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plasticity material properties
Hi , i try to solve one structural mechanics problem. In my case, i want to give yield stress level and isotropic tangent modulus properties to my model.i found one similar tutorial (snap hook) in...
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problem with port boundary condition
Hi, I am trying to simulate a coupler so I need to set a port as inport and I have to select "wave excitation at this port " check box but it's inactive. How can I activate it? Thanks, sara
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Flux units in surface reaction interface module, and modeling of surface...
Hi, I am trying to model a bulk - surface reaction-diffusion system (diffusion in the solution, diffusion on the surface, and adsorption/desorption which couples the two together). The system has a...
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Electromagnetic forces on parallel current-carrying wires - Comsol example
Dear all, I suppose that Comsol example: Electromagnetic forces on parallel current-carrying wires in ACDC_Module/Verification_Models/parallel_wires should be fully and properly working example. I...
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output not saved
I have been running a number of long running transient cases.I ensure that I output the results often enough. However, I have noticed that if I kill the job, before it's complete, none of the output...
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thermally resistive layer
Hi everyone, I am modeling a pipe with fluid circulating within by coupling heat transfer and fluid flow and the pipe diameter is defined in the geometry section. i need to define the pipe wall...
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wireless power transfer by pcb coil
Dear All, I want to model and simulate a wireless power transfer module. Its application is in microchip implant. The model has two 3D microstrip(PCB with substrate) coil. One for transmitter and the...
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What is convergence?
I'd just like to know what convergence is - in the context of COMSOL.
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Extruding a hexagon polygon
I want build a prism with a hexagon cross section but am having some issues. I have drawn a hexagon polygon and tried to extrude this but it doesn't seem to be working. Any suggestions would be greatly...
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hyperelastic material in contact with a rigid material
I'm trying to model the stresses in a hyperelastic material as it's removed from a highly rigid material (which is acting as a mold). I've set up a time-dependent model with the two materials, a...
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helix with rectangular cross section 2
Hi, I was following the thread re: helix with rectangular cross section and downloaded the file helix.mph. By fudging the parametric values, I almost get what I need except the the major radius appears...
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Problem with model 8649 plasma module
Hi , I was trying to duplicate www.comsol.com/showroom/documentation/model/8649/ this model. I’m using Comsol 4.3, So I downloaded the corresponding files and Pdf. When I started following the same...
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Eigenfrequency Problem
Good evening, I'd like to know if there's a way to find the highest, maximum , eigerfrequency of a structure using COMSOL.
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