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how to define a force normal to a surface
Posted 11 mars 2010, 08:36 UTC−5 1 Reply
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Hi,
the problem is:
I want to calculate the deformation of a hollow volume when the air inside heats up, because of the thermal expansion of the gas. Instead of going to multiphysics I think it would be easier just to calculate the final pressure and to add the internal pressure as the load.
The problem is that the volume has a shape that is not linear, so it does not help me to add to all boundaries the force (or pressure) divided in the Fx and Fy components, and to model it using polar variables also doesn't, since the shape is not circular. How do I define a force that is constant and always in the direction of the normal to the surface?
Thank you
Piergiorgio Antonini
the problem is:
I want to calculate the deformation of a hollow volume when the air inside heats up, because of the thermal expansion of the gas. Instead of going to multiphysics I think it would be easier just to calculate the final pressure and to add the internal pressure as the load.
The problem is that the volume has a shape that is not linear, so it does not help me to add to all boundaries the force (or pressure) divided in the Fx and Fy components, and to model it using polar variables also doesn't, since the shape is not circular. How do I define a force that is constant and always in the direction of the normal to the surface?
Thank you
Piergiorgio Antonini
1 Reply Last Post 12 mars 2010, 02:28 UTC−5
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Posted:
1 decade ago
Hi
depending on the module you are in, but you have the option to work in the surface local coordinates with a normal force/pressure and not only the x-y coordinae ones. The same you have also follower pressure I believe see smref.pdf (I have no access just now to COMSOL)
good luck
Ivar
depending on the module you are in, but you have the option to work in the surface local coordinates with a normal force/pressure and not only the x-y coordinae ones. The same you have also follower pressure I believe see smref.pdf (I have no access just now to COMSOL)
good luck
Ivar