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Discretization of the Diffusion Term

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Old   October 24, 2005, 12:43
Default Discretization of the Diffusion Term
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Rui
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Hi,

In CFX, the Diffusion term is evaluated at each integration point, ip, according to the documentation, as:
  • <font color="blue">( k * d_phi/d_x * Dn )@ip</font>

the derivative <font color="blue">d_phi/d_x</font> is approximated as:
  • <font color="blue">(d_phi/d_x)@ip = sum( (d_N(n)/d_x)@ip * phi(n) )</font>

But how is the diffusion coefficient <font color="blue">k</font> obtained at each integration point? Also with shape functions?

Thank you. Regards,

Rui

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