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Calculation of electrostatic forces

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Dear all,

I have a querry regarding electrostatic force calculations in comsol 3.5(a). According to the manuals and few tutorials on calculation of electrostatic forces in MEMS module, it seems to me that we can only calculate the electrostatic forces on boundaries of the computational domain (i.e. they are boudary variables only). If in case I want to calculate the electrostatic forces inside a particular subdomain (as a body force N/m^3) what should I do???

If any one of u out there has ever tried to calculate this, I would really appreciate his/her cooperation.

Thanks in advance

1 Reply Last Post 2012年10月16日 GMT-4 10:40
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)

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Posted: 1 decade ago 2012年10月16日 GMT-4 10:40
Hi

I do not believe it works, as the forces ()via Maxwell stress tensors are defined as integration over boundaries of the gradient of the fields (measured from within a single material), preference air or "vacuum"

And I do not believe this is version dependent. Then another way is over virtual work integration ? that is described somewhere if I remember right, heavier to set up
--
Good luck
Ivar
Hi I do not believe it works, as the forces ()via Maxwell stress tensors are defined as integration over boundaries of the gradient of the fields (measured from within a single material), preference air or "vacuum" And I do not believe this is version dependent. Then another way is over virtual work integration ? that is described somewhere if I remember right, heavier to set up -- Good luck Ivar

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