CFD Online Discussion Forums - Adding Curvature Induced Flux in Diffusive Flux Model for Shear Induced Migration

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Adding Curvature Induced Flux in Diffusive Flux Model for Shear Induced Migration

Hi,
I want to add curvature-induced flux to the total migration flux in the Diffusive Flux Model equation for shear-induced particle migration.
The equation for curvature-induce flux is given by:
$N_{c}$ = $K_{r}$ n $\kappa$ $a^{2}$ $\dot{\gamma}$ $\varphi$

Where n is the unit normal vector in the radially outward direction in a curved streamline shear flows $\kappa$ is the curvature of the streamline.

Can somebody help me to implement the above equation in OpenFOAM?

I really appreciate any help you can provide.

Thank you!