[hyperion]

could someone explain the final expression for the reflected velocity vector in the diffuse wall interaction model in dsmcFOAM. It looks like it's supposed to be the most probable molecular thermal speed times a random vector, but the most probable molecular thermal speed is (2kT/m)^1/2. Looks like they left out the 2??? Thanks.

00109 U = 00110 sqrt(CloudType::kb*T/mass) 00111 *( 00112 rndGen.GaussNormal()*tw1 00113 + rndGen.GaussNormal()*tw2 00114 - sqrt(-2.0*log(max(1 - rndGen.scalar01(), VSMALL)))*nw 00115 );