Scalar problem -- CFD Online Discussion Forums

November 21, 2003, 08:23	Scalar problem	#1
Dougal McQueen Guest Posts: n/a	{CFX-4} I am advecting a scalar quantity into the domain (potential temperature = 293) by setting the inlet boundary condition with usrbcs. The trouble is the scalar disappears downwind (not a transient run). The inlet condition is correct, but quickly downwind the scalar quantity disappears to zero. I have the diffusivity set to 2.7e-05 (which taken from physical charts). Anybody know any reason for this. Also, I want to know whether my wall boundary condition for the ground is set right using usrbcs. I have set A=1, B=0, and C=ground temperature. Many thanks in advance Dougal

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