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Create a Surface between two adjacent blade in CFD-Post

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Old   September 2, 2020, 11:58
Default Create a Surface between two adjacent blade in CFD-Post
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Hello all,

I have simulated a flow in a centrifugal turbomachine with ANSYS CFX. The simulation is done using periodic boundary conditions, thus is done for only one blade. I would like to create a Surface starting from a Pressure suction of one blade to the suction side of the adjacent blade to display a velocity vector, however, using tools in CFD-Post, I am only able to create the surface from one periodic boundary to the next periodic boundary. I would like to ask if any one has an idea how to define a blade between two adjacent blade?

Thanks
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Old   September 2, 2020, 13:03
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Have you tried instancing the passage?

Go to your Domain, and activate instancing. Create one instance of the passage, and the surface you created will span from suction to pressure side of the instanced blade.
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Old   September 2, 2020, 13:50
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Hello,

Thank you for your reply. I have tried this suggestion before and this is not working unfortunately. It just rotate the surface for one periodic angle.
Attached are pictures showing the initial plane and the other is what I got doing the instance.

Maybe something like Data Instancing would work but this feature is only available for Transient Blade Row simulation
Attached Images
File Type: jpg Plane ANSYS CFD-Post.jpg (69.9 KB, 8 views)
File Type: png Instancing.png (156.4 KB, 6 views)
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Old   September 2, 2020, 16:40
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Do you want to visualize a plane in a radial machine? or a cylinder?

I would have created a surface of revolution instead of a plane, or a constant span surface.

If you want to visualize what is happening across a rotational periodic surface a cylinder will show what is happening at a constant radius.

Not certain what information you are looking for.
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Old   September 2, 2020, 16:57
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Thanks for your reply.

Unfortunately I am not looking for a constant radius surface, or a surface at constant span or streamwise. What I am looking for is a flat surface that is defined with a point (at the center of passage) and a normal direction (which is in direction of the core flow in center) so that's why I need it to be defined in one passage from PS to SS. I think it can not be easily done with POST-CFD, however, I appreciate your time and reply.
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Old   September 2, 2020, 18:09
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There is always a harder way to do things, right? Assuming it is a steady-state simulation, here is a workaround

Since you already got a converged solution (the hard work is done), you can double the model, i.e. replicate the passage in CFX-Pre and set it up with two sectors instead.

Restart the solution using the single passage results and instance the solution for the initial values file, the solver will interpolate/copy the data on the passages and it should converge quickly for the two passage setup.

Now create a plane across the two passages and it should work, correct?
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Old   September 3, 2020, 04:44
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Yes, I guess this suggestion plus using appropriate plane bounds might work... Will try it out but hope I can find other solution since it is a dozen of simulations Thank you for your reply.

Cheers
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