Viscous term in NS

General Discussion
1

Hi everyone,

I’m trying to solve the term

\nabla\cdot(\nu_t(\nabla\mathbf{u}+\nabla\mathbf{u}^T))

and extract the x and y component but I’m struggling with implementation. I guess it’s best to use varf but I’m pretty new to FreeFem and have no idea how to do this.
Thank you

2

In the FreeFem documentation you can look at the section “The system of elasticity” to see how such term is handled.