I'm using darcy flow and heat transfer physics to couple heat advection with water flow in 3-dimensions. I've used the flow terms for the u, v, w heat coefficients, e.g., (-kap_dl/eta_dl*px)*(Cp_c*rho_c). I'd like to quantify and export the calculated flow velocities, but do do see terms like these in the 'fea' variable output. It lists geometry, time steps, temperatures, etc., but apparently not velocity components (aka flux).
I'm happy to share model if needed. Please advise.
As the flow velocities are defined as expressions for the heat transfer mode (in contrast to dependent variables for flow modes) the should be available in the "fea.expr" field. According to the first column these will most likely be named *u_ht*, *v_ht*, and *w_ht*. The you can use the "evalexpr" / "evalexprp" functions on the command line to evaluate them in any points / gird points.