[berk can]

Dear all,

I am trying to optimize a Francis Turbine with NUMECA. I have the inlet and outlet BCs. But these conditions are valid for the passage which includes also stay vane and guide vane not only runner. Meanwhile, I only optimize the runner. Therefore, after meshing, first I made a CFD analysis with all parts and got the result. Then, I follow the Design3D tutorial for Rotor37 optimization.

In the blade fitting phase, I got confused which one I need to choose for the parametric template because there is not one for francis. At that point, I followed two ways. First, I chose centrifugal compressor and modified it according to my geometry. Then, I passed to CFD screening after creating .par file. For computation management, I choose 3D associated computation and my CFD analysis came directly. I chose the mesh file... etc. and when I started in new CFD analysis, there was always an error. Does the reason come from the choose of centrifugal compressor or may there be something else?

Second way I followed is to skip blade fitting part because in the meshing part a .par file was already created. And, in the CFD screening, I give this .par file as an input to the program and the rest is the same with previous way. But, this time there is a problem in meshing . It is said that mesh file is not compliant with geometry file.

I also tried to use 3D wizard option in CFD screening, to utilize reference geomturbo file option in mesh generation and to create my own parametric template in AutoBlade. However, I couldnt achieve to complete my optimization. Can the reason behind it be the three blade that I have in flow passage? Although I fit the blade just for runner, in 3D associated computation I introduced the CFD analysis for the whole passage (actually it is automatic I couldnt choose one).

If you have any idea and/or suggestion, I will be happy to hear it.
Thank you.