Learning Forum

[avillanueva]

Hi,

I am running simulations of a circulating water tunnel. I set up peridic boundary conditions at the inlet and outlet (surfaces spaced by 1 mm) and applied a mass flow rate of 20 kg/s so that the flow at the outlet is the same as the flow in the inlet. When I set a pressure gradient of 0 Pa/s and run the simulation, somehow a pressure gradient appears which is completely false as seen in the picture. I am not sure if I am using the right method to simulate the flow in a circulating water channel. How would you procede? 

[Rob]

If there is 0Pa then there shouldn't be flow, but I'd also expect the residuals to not be showing a coverged solution.