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[TurboGrid] Backward Facing Step at Hub

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Old   August 18, 2020, 22:10
Default Backward Facing Step at Hub
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Hello everyone,


For my thesis work I am meshing an axial turbine blade with ANSYS Turbogrid. The geometry provided, however, has a backward-facing step on the stator-rotor interface. My intention was therefore to divide the rotor inlet into two parts (which would be set as inflow and wall boundary conditions).


Would anyone have any idea how it is possible to split blocks on a reference surface?


Otherwise, a possible alternative would be to import the Turbogrid mesh into Pointwise. However, I cannot find a suitable way to do this conversion. Has anyone ever had to switch from Turbogrid to Pointwise?


Thank you in advance!


Andrea
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Old   August 19, 2020, 10:05
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Henrique Stel
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Could you attach images to give a better idea about what you want to do?
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Old   August 19, 2020, 10:29
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Thank you for your reply!


To explain in a better way what I meant I attached a previous mesh created into Pointwise. In the picture inlet surface is splitted in two parts: the orange one is set as inflow boundary condition, while the yellow one (the backward facing step at hub) is set as wall boundary condition.


Rotor_Step.jpg


So what I am asking for is if it is possible to split the entire mesh at a certain radius (more or less as what Turbogrid do to create a shroud gap, but keeping the blade).
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Old   August 20, 2020, 07:29
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Quote:
Originally Posted by Turbofan View Post
Thank you for your reply!


To explain in a better way what I meant I attached a previous mesh created into Pointwise. In the picture inlet surface is splitted in two parts: the orange one is set as inflow boundary condition, while the yellow one (the backward facing step at hub) is set as wall boundary condition.


Attachment 79736


So what I am asking for is if it is possible to split the entire mesh at a certain radius (more or less as what Turbogrid do to create a shroud gap, but keeping the blade).
I'm still not 100% sure if I understood the problem, but from what I see you have a small step at the bottom of the inlet facing in the same direction of the inlet, right?

Well, if this is the case, so I don't think you will be able to split that on TurboGrid, either during the meshing process or by manually managing the hub/shroud (not sure to whom the step belongs to) curve points.

What you can do, however, is to displace the inlet back or forth so that the step will become a part of the hub itself, not the inlet (you can make it as a part of the rotor or the stator).

Another thing that you could try is to make the step as a part of the inlet as if there was no step at all, and then import the mesh on ICEM and try to manually assign the bottom faces as another part (the step). This one is tricky and "highly non-ideal" if we can call it that way but it's just something you could try, maybe it can serve you any purpose.
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