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Comparing comsol plots
Hi all, Am doing an optimization study to find the best boundary condition suitable for my application. I have simulated my design with various boundary conditions and have obtained the plots. please...
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Difference between Time dependent and Time discrete
Hi, I am working on a conjugate heat transfer problem. By t=20s, the system reaches steady state. Then I would like to see the system response after t=20s, using step function to switch off a source...
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how to switch boundary conditions between float potential and ground?
Hey I was trying to switch the voltage between ground and float to a boundary in electric current physics. I can either apply floating or grounding condition to a boundary, but not able to switch these...
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scaling in contact analysis
Hello, What is the function of scaling in mechanical contact analysis (it is located under study>solver configurations>dependent variables)? Does it have any effect on the solution? If it is,...
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Problem while changing the study steps of a time dependent model
Hi I just faced a strange problem with COMSOL, I have a time dependent model which runs perfectly fine from t=0 to t=1e-6[s]. In this model I divide the interval into 20 steps for getting results:...
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ASK: easy functions in COMSOL4.3
Hi there, I am now trying to model a moving laser beam (as heat flux) on a steel plate. I try to do this by following steps: 1. build a solid block (domain 1) to represent the steel plate. 2. set 'heat...
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3 point bending - COMSOL vs. ANSYS - large error in COMSOL?
Hello, I am doing a „3 point bending“ experiment, where I measure various deflections for a range of applied forces from 1-18N. For example: at 9N the deflection is 2.4 mm I also simulated the...
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adding a electrical circuit to a coil
How can I add an electrical circuit with a coil? I have two coils and I am trying to find out the power transmission from the sending coil to the receiving coil.Please tell me how can I connect...
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plots
i have top and mottom temperature of a membrane and i want to get a sinosoidal output showing how temperature rise and fall with time . is there any option to get sinosoidal plots
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Zero Magnetic Scalar Potential, which boundaries to define?
Hello there! I am actually studying ferrofluids, and their use in the sorting of non-magnetic particles. I am right now at the step of simulating the magnetic field in the micro-channel, where the...
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PID with constraints
Hi All, I have implemented a PID temperature controller in my model that controls the voltage applied to a resistive heater to achieve a set temperature. However the PID algorithm achieves this...
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Adding Refractive Index
Hi I m a beginner in COMSOL. I m working on GaAs-Air interface. I want to know how to add refractive index to GaAs manually from material properties. I searched in material properties but couldn't...
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Hi all , How i can centered line graph to origine
Hi all Comsol's users , i am a new user and still exploring the comsol. so, I want to center this line graph to (0,0) in attached picture.
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Space-Time plots
Hello, do you know if there is a way to produce space-time plots in COMSOL 4.3? I'll explain better my problem. I am simulating a rection-transport problem in 2D geometry with the time dependent...
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NONLINEAR SOLVER DID NOT CONVERGE
Hello everyone, I am facing a nonlinear problem,for simulating electromagnetic flow meter .please help me choose the correct boundary condition as well as others.
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exporting data in comsol 3.4
hi Can anyone help me to export data from COMSOL 3.4 which are required to validate with the available experimental data?? rgds Anup
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a problem with boolean operation Difference
Hello! I'm trying to create a cylindrical hole in a cube. So I built a cube by extrusion from a plane and a cylinder inside this cube by extrusion from a plane. Length of the cylinder is equal to the...
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how to couple two different physics?
Hi Dear friend I am using Physics "Transient heat diffusion equation in solid" to calculate T(x,y,z,t). Now another Physics "Distributed ODEs and DAEs(dode)" is used to write the following equation:...
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Wavelength Sweep with parameters from text file
Hi I m a beginner in COMSOL. My structure is shown in picture. Its is Au-GaAs-Air structure from bottom to top (2D). Simply I can brief out my objectives in following steps. 1) Have refractive index...
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Applying external strain
Hi All I am doing simulation to study elastic properties of cylindrical abject. I want to apply external strain on top surface of the cylinder. So how can COMSOL handles such cases? Thanks
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