Pure diffusion quaestion -- CFD Online Discussion Forums

October 10, 2013, 05:15	Pure diffusion quaestion	#1
sasha1989 New Member Join Date: Oct 2013 Posts: 6 Rep Power: 12	Hi, Problems with equilibrium concentration distribution in pure diffusion (no flow eq. activated) problem. Setup: the rectangular domain divided into two equal parts. Two incompressible ideal gases with different molecular weights (ratio 2:1) fill each its half of the domain fully - initiated using patch, e.g. left c(firstgas)=0, right c(firstgas)=1. Steady solution should be an equilibrium uniform concentration distribution, i.e. 2/3 of one gas and 1/3 of the other - BUT IT IS NOT!!! some mass is missing... Tried the same with heat - again the equilibrium temperature is not the same as it should be accounting the initialization patch. Please help, Thank you.

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