I am simulating an axial turbine. Under relaxation factors are default.
Residuals are as follows:
And also, mass flow rate, torque (in direction of Y) and inlet and outlet total pressure are as follows(in order to judge on convergence):
Torque (in direction of Y):
Inlet and outlet total pressure:
Mass flow rate in inlet and outlet:
Now, I have some question about Residuals:
As you see in first figure, residuals decrease until about iteration of 1500 and then after iteration of 1500, residuals increase. I want to know that this event is logical or not. I already thought that residuals should decrease decidedly because of convergence. But in this simulation, residuals increases and decreases!! What is reason for this event? According above figures, Is solution converged?