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-   -   CFD_screening problem for Francis Turbine Optimization (http://www.cfd-online.com/Forums/numeca/129851-cfd_screening-problem-francis-turbine-optimization.html)

berk can February 14, 2014 09:00

CFD_screening problem for Francis Turbine Optimization
 
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.

Hamidzoka February 17, 2014 16:19

Could you please give the error massage shown in the Design3D?

regards

berk can February 19, 2014 08:48

When I followed the process I described as "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." , I got the following error: "AutoGrid template for mesh '_mesh' does not seem compliant with the geometry file. Please check the associated .trb file or geomTurbo settings for output names!".

When I created my own template in Autoblade and went on same steps with that, I got the same error: "AutoGrid template for mesh '_mesh' does not seem compliant with the geometry file. Please check the associated .trb file or geomTurbo settings for output names!". But, if I also choose Reference geomTurbo file option and choose the file path of geomTurbo file in mesh folder, then the error is "DESIGN3D : RUN TIME ERROR" and explanation is "DESIGN3D STOPPED DUE TO THE FOLLOWING ERROR CFView failed during the processing of a macro. Please check the log file to know which macro is involved."

Hamidzoka February 22, 2014 13:08

Note that your geomturbo and par files should be identical.
open your *.par file in Autoblade, export a *.geomturbo file and then generate your mesh with it. after generating mesh file (i.e. igg file) you should have a run file linked correctly with this igg file.


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