[Ash95]

Hello,

I am simulating blood flow in arteries using STAR CCM+ and need to create the following custom field functions

1. Time Averaged Wall Shear Stress (TAWSS)
2. Time Averaged Wall Shear Stress Gradient (TAWSSG)
3. Oscillatory Shear Index (OSI)
4. Relative residence time (RRT)

I do not know how to create TAWSSG as a custom field function. I have tried the grad operator, but it doesn't allow me to perform partial differentiation of wall shear stress components (Tx,Ty,Tz) with respect to (x,y,z,). Would appreciate any input.

The functions are as follows:https://ibb.co/jrTk4d

(Note that T,Tau0, and Dg are constants)

Many thanks