27-08-2012, 10:32 AM
COMSOL
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INTRODUCTION
COMSOL is a MEMS design simulation software. COMSOL stands for common solution. Earlier it was known as FEMLAB. Initial version 1.1 of COMSOL was released in year 1998, which include structural module only. As time passes more advancement in software take place. In year 2000 chemical engg. Module was added to this. In year 2008 an advanced version 3.5a released . Latest version of COMSOL is COMSOL 4.2a which was released on 14th Oct. 2011
Why COMSOL?
COMSOL is the software which allows multiphysics coupling. It means we can easily see influence of one physics on other. It is very much user friendly. We can analyze almost all the parameters of a MEMS device using only this software tool.
1. SUBDOMAIN SETTINGS:
In subdomain setting we apply the material. i.e. give material property to the device. In COMSOL we have more than 3200 materials available. If a particular material is not available we can use it by giving four basic material properties named Young Modulus, Poison ratio, Density, thermal Coff. Of expansion.
2. BOUNDARY SETTING
In boundary settings we apply constraints. In solid stress strain the constraints would be to fix a particular side or make it free. In electrostatic module the constraints would be to apply ground or give potential to a particular boundary.
3. MESHING
Meshing is the important step in analysis a geometry. Meshing is a process of converting a continuous domain into discrete subdomains. It is basically used to increase the accuracy of the result. In COMSOL we have meshing size ranging from Fine Meshing to extremely coarse.
4. SOLVING
In solver setting we apply the analysis parameter like transient response, parametric variation, eigen values, e.t.c. for ex. If we want to study Eigen frequency of the membrane then we choose Eigen frequency in solver settings. After selection we solve the geometry to view the result.