[Smile_]

Hello,

I'm conducting a simulation of water enterring a porous region and I want to observe the evolution of the temperature inside it during a certain time.

So I chose a laminar flow (Reynolds < 3000), segregated and implicit unsteady (time step of 0.5s for 180s in total).

For my first try, my residuals are all converging nicely but only the energy residuals are forming the "spike pattern" that we normally see for an unsteady simulation. The continuity and XYZ momentum are acting like in a steady state simulation, they are all flat. (if the simulation is adiabatic, there are no spikes either).


So my question is: is it normal that in an unsteady simulation my dynamic residuals are flat? Is it because of my porous region?


Any help would be very appreciated