# How to incorporate Darcy's raw into Conv-Diff

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## How to incorporate Darcy's raw into Conv-Diff

 I would like to incorporate the velocity calculated by Darcy's law into Conv-Diff, how is this possible? Darcy's law has no variable for velocity, how can I incorporate u=-k/μ by Darcy's law into the velocity w of convection-diffusion equation?
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## Re: How to incorporate Darcy's raw into Conv-Diff

 Administrator You can enter the explicit expressions for the Darcy velocities in the edit fields for u, v, and w in the convection and diffusion dialog box, that is:  u: -kap_dl/eta_dl*px v: -kap_dl/eta_dl*py w: -kap_dl/eta_dl*pz 
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## Re: How to incorporate Darcy's raw into Conv-Diff

 Thank you for your answer. I was having trouble getting Featool to work because I thought the notation for pressure p was the same as 'edit' of 'Equation'. It worked fine, thanks.