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bringing B-spline surfaces into COMSOL

I have used MATLAB to define a series of B-spline parametric surfaces that I wish to knit together to a solid object in COMSOL. My current approach for bringing these into COMSOL is to create a...

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tic/toc in matlab for COMSOL

I have a model inside a for loop and occasionally it runs into an extreme parameter value and I want to just skip that iteration. I tried increasing the interations a lot and then saying skip the...

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i m new to comsol 4.2 so if any one could help me in the micro beam resistor

about microresistor beam

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Simulation of a sollar collector

Hi everyone I'm a French engineering student and I need to simulate a solar collector in COMSOL multiphysics. I build the panel with glass, air gap, copper, water and insulation but I have a problem...

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DISPERSION Modeling

Hi frndz! I am working on a model of the dispersion of gases which i have uploaded here. It is time depended modeling and In stationary case there is no error but when i Run for TIME depended case i...

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Copper Deposition in a Trench - Simulating the closure of the trench...

I need to simulate the closure of the trench for the example provided in the Electrodeposition Module as a tutorial model: Copper Deposition in a Trench. Attached you can find what happens after 14...

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Use of lower limit in segregated step

Hello Im solving a coupled problem that has turbulent flow and reaction, to certain values I obtain negative values for concentration, but I see there is a lower limit after calculation of ep and k...

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AC field Simulation

Hi, I have to do a simple Simulation in comsol multiphysics 4.1 and i am just a beginner in this work,i have to build an electrode geometry and apply various frequency and voltage ac signals and see...

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Dielectrophoresis simulations or gradient of electric field

Hi, I am doing dielectrophoresis simulations using simulations. Basically I use AC/DC module -conductive medium DC to get the electric field distribution. But I face some problems geting gradient of...

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AC current induced oscillations of electrothermal actuator driven by the...

Hello everybody, I'm trying to simulate a resonance mode oscillations of bimorph electrothermal actuator driven by Joule heating through AC current. So far I've been trying to realize it through...

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Simulation error

Hi , I am getting this type of error whey i am trying to start simulation. "Variables property does not include all variables in Xmesh" Could anybody can give me any solution/ suggestion. Thank you...

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Magnetic field

Does anybody know how to write this expression on comsol ( ∇/B/^2 )? I meant expression that replace "the gradient of the magnetic field norm square". Thank you

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Rotation

Hello, I am trying to allow the remanent flux density within a magneto-active elastomer (MAE) to rotate with the elastomer as a magnetic field is applied to the material. Within the ampere's law that...

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Laminar-Two-Phase-Flow - Filling of a Pot

Hi, I've done a lot of simulations with comsol 4.3 and they worked. My modell is a pot which is filled with water.I'm using the laminar two phase flow in 2D with the phases water and air. i have two...

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comsol's algorithm for determining number of domains

I am running COMSOL w/ Matlab for an optimization of a geometry and need to be able to know the number of domains formed by 4 curves. The problem is stated as: I need an algorithm to determine how many...

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about the steady and unsteady simulations

Dear Sir or Madam, I meet some problems about the simulations of fluid flow in channels. When you do some simulations related to fluid flow, how do you judge whether it is a steady issue or not? For...

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Merging 2 models

I have a Comsol Model of a Maxwell Coil and a model of Helmhotlz coil with defined geometries. Now I want to make a simulation in which I can place these 2 coils together and simulate their magnetic...

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laminar flow in a tube under oscillating force

hello everybody, Im modeling a pipe that with laminar flow inside and that is subjected to oscillating force. I want to see the fluid's influence on the pipe when vibration. This is a very simplified...

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Local Edge System

Hello, I'm trying to implement a "Predescribed Displacement" Condition on an Edge using the local Edge Coordinate system. But i have the Problem that i couldn't find a reference to the "Local Edge...

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Using Comsol Multiphysics 4.2

Hello, I started using Comsol Multiphysics 4.2 and I draw a complete system. However I realized that I made ​​a mistake on dimensions. How can I do to correct the schema from one side without doing all...

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