Learning Forum

[cibi]

Hello everyone, 

I am trying to compute the platelet lysis index (PLI) in my simulations by solving this transport equation: 

where tau is the shear stress. 

My simulations are steady state, so if I have understood correctly from Ansys Fluent User Guide, this is the type of equation I am solving in Fluent with the diffusion coefficient equal to zero:

I have prepared the UDF for my source term:

To obtain convergence in my simulations I had to change the under relaxation factor of my UDS to 0.50.

After runnign my simulation I use CFD post to compute the power of my scalar (PLI = scalar 0 ^(1/0.77)).

I am expecting a PLI distribution similar to this:

But the resuls that I get are like this:

 

I also tried on a simplier geometry and I think that the results are stil wrong in terms of values but the colormap is more similar to what I am supposed to obtain:

I was wondering if there is something wrong in my code for the source term or if this might be related to something else?

Thank you in advance!

Claudia