[hellsblade.91]

I am running a simulaion on fluent wherein i am trying to simulate a flow from the inlets to the outlet

Goal is to check no of inlets and pressure needed to get maximum pressure and velocity at the outlet.

BC. Pressure Inlet - 6 bars
Pressure Outlet

Transient sim
K-eplison model

Attached are the contours showing the location of inlets and outlet and the mesh

My doubt was how will my mesh cell size affect the no of time steps needed to run my sim

Currently I am running my sim for a time step size of 0.001 with no of time steps of 10,000


Do i need larger no of time steps if i need run my sim for 20 s


My fluid air in this case is at a high pressure 6 bars so I am using PISO( Pressure Coupled Solver )
as the flow would be unsteady will PISO be enough or do i run it on couped

Will the gravity option also cause an intability in the resuts