Simulation of an oil flow through a nozzle
I want to simulate the oil flow through a nozzle and examine the pressure conditions behind it (Vacuum chambers in the picture).
I use a tetrahedron mesh with inflations at the wall. The Mesh-Quality and the Skewness is good and the y+ is < 1 ( sst k-omega turbulence model is used)
The oil has a constant temperature of 50 degrees celsius
The pressure at the Inlet1 is 3000000 pascal.
The pressure at the Inlet2 is 150000 pascal.
The pressure at the Outlet is 0 pascal (atmospheric pressure)
for a better estimation of the dimensions: The nozzle reduces the diameter from 7mm to 1mm
Settings in the "setup": -Pressure-Based Solver
-sst k-omega turbulence model
-Energy is off (because of the constant temperature)
-The Solution Methode is "coupled"
My Problems: the calculation does not converge
Do I use the right turbulence model?
What can i do to improve the convergence?
Thank you in advance