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December 12, 2010, 13:03 |
Molecular diffusion
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#1 |
New Member
Join Date: Dec 2010
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Hi forum
I am a rookie in CFD modelling, currently a bit confused about physics of molecular diffusion and its implementation in Phoenics. I would like to study the distribution of species concentrations and I am unsure about the setup. In the transport equations for momentum and energy solved with the CFD code the exchange coefficients are (laminar) viscosity and (laminar) thermal conductivity, respectively (as long as the flow is laminar). Both values can be changed by the user. In my opinion the exchange coefficient for the transport equation of species concentration should be the (molecular) diffusion coefficient depending on the species' considered, total pressure and some more. However, I cannot find a possibility to enter this quantity. Although I believe that my results wouldn't change significantly (since the flow is turbulent), the question arises if and how molecular diffusion is considered in the program... Many thanks Sören |
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