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radial velocity to velocity vector input
Posted Jan 6, 2010, 2:22 p.m. EST 1 Reply
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I am trying to simulate a drug release pattern from biodegradible polymer implants in a brain. I am using 3D Convection and Diffusion model (transient) and I would like to input radial velocity of the fluid in a brain subdomain. Because I can only use cartesian coordinates in COMSOL, I would like to change radial velocity (v_r) to velocity vectors (u, v, w). How can I change that? (There is no v_theta and v_phi.)
1 Reply Last Post Jan 6, 2010, 5:42 p.m. EST
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Posted:
1 decade ago
Hi
you can change your variables, but by default the spherical coordinates are not implemented as is. You must write out the formulas yourself.
Depending on what exactly you need you can sometimes get around with a coordinate frame or WP change, there is an example somewhere about applying torsional loads (cylindrical coordinates) in the Structural Module doc.
And take a look at the KB and try "spherical" in the search there are a few topics/ explanations there too
As well examples in the model gallery
Hope this helps
Good luck
Ivar
you can change your variables, but by default the spherical coordinates are not implemented as is. You must write out the formulas yourself.
Depending on what exactly you need you can sometimes get around with a coordinate frame or WP change, there is an example somewhere about applying torsional loads (cylindrical coordinates) in the Structural Module doc.
And take a look at the KB and try "spherical" in the search there are a few topics/ explanations there too
As well examples in the model gallery
Hope this helps
Good luck
Ivar