I am simulating a axial turbine and number of cell are about 3000000.
Under relaxation factors are as follows:
Turbulent kinetic energy: 0.5
Turbulent dissipation rate: 0.5
Velocity formulation is relative.
Turbulence model is K-E relizable. The convergence of solution is monitored by checking the residuals of the numerically solved governing equations. Moreover, in order to judge the convergence, the behaviour of other quantities, such as the total pressure at the inlet and outlet boundaries, and torque coefficient generated by the rotor, are also monitored. Here, the default convergence criterion of each residual is reduced in order to allow the monitored quantities to stagnate at consistent values. It seems that convergence is ok but there is reverse flow!! why?
total pressure at the inlet and outlet boundaries:
Mass flow rate:
I continued this run and is as follows:
Residuals are almost constant. What is the reason?
Is convergence OK?
I am grateful that guide me about this case.