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Mathematical particle tracing: Diffuse scattering wall condition
Posted 2 mai 2013, 21:37 UTC−4 Charged Particle Tracing, Particle Tracing for Fluid Flow Version 4.3a 1 Reply
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In Comsol 4.3a the diffuse scattering boundary condition is incorrect. it generates an angular distribution with respect to the surface normal of cos(theta), while the correct distribution is cos(theta)*sin(theta). In equation view you see that theta is is chosen by
theta = acos(0.5+random(xxx))
the correct expression is
theta=acos(sqrt(0.5+random(xxx)))
see J. Greenwood, Vacuum 67 (2002) 217–222
Comsol support showed me how to fix this in equation view. The original expression is incompatible with detailed balance
theta = acos(0.5+random(xxx))
the correct expression is
theta=acos(sqrt(0.5+random(xxx)))
see J. Greenwood, Vacuum 67 (2002) 217–222
Comsol support showed me how to fix this in equation view. The original expression is incompatible with detailed balance
1 Reply Last Post 3 mai 2013, 00:48 UTC−4
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Posted:
1 decade ago
Hi
thanks for reporting this to us out here ;) so long COMSOL has been informed to fix this for next release, the most important have been done
--
Having fun COMSOLing
Ivar
thanks for reporting this to us out here ;) so long COMSOL has been informed to fix this for next release, the most important have been done
--
Having fun COMSOLing
Ivar