Splitting a surface so part stationary and part is rotating

turbo5 · July 20, 2017, 06:02

Hi,

I have a bit of a problem, I am trying to model a turbine and include a mesh for the backdisk cavity. To do this correctly I want to be able to divide the hub surface into three parts, so that I have a counter rotating (stationary) wall section at the inlet, a small section just before the leading edge to be an interface with the cavity and finally a rotating section that the blade is on.

Can anyone suggest a method to achieve this? Due to the proximity of the blade leading edge it really needs to be a single mesh for the domain.

Thanks

ghorrocks · July 20, 2017, 06:43

This sounds like elementary geometry modelling and meshing to me. Have you done the geometry and meshing tutorials? They are available on the ANSYS community webpage.

If you want us to help you on your specific problem you will have to post some images of what you are trying to model.

turbo5 · July 20, 2017, 06:54

Hi, thanks for the reply. I initially tried to solve this from a geometry/meshing approach, with little success. Ideally I would like to produce the mesh with TurboGrid as it is a simple way to get a good structured mesh. However, as far as I am aware I can only load one hub curve into it, which it would will only consider as a single surface. I also tried setting an inlet domain, which did split the surface in two, but as it was so close to the leading edge the mesh quality was very poor. I have also tried bringing the TurboGrid mesh into ICEM to split the surface but that didn't work either.

I will try getting a few images put together when I get back to the office in a few days.

Thanks

ghorrocks · July 20, 2017, 06:56

I am not an expert in Turbogrid so I cannot help you there. But you should be able to get geometries and/or meshes out of Turbogrid and into ICEM or DesignModeller and you can generate the other features there.

July 20, 2017, 06:02	Splitting a surface so part stationary and part is rotating	#1
turbo5 New Member Join Date: Jan 2016 Posts: 4 Rep Power: 10	Hi, I have a bit of a problem, I am trying to model a turbine and include a mesh for the backdisk cavity. To do this correctly I want to be able to divide the hub surface into three parts, so that I have a counter rotating (stationary) wall section at the inlet, a small section just before the leading edge to be an interface with the cavity and finally a rotating section that the blade is on. Can anyone suggest a method to achieve this? Due to the proximity of the blade leading edge it really needs to be a single mesh for the domain. Thanks

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July 20, 2017, 06:43		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,694 Rep Power: 143	This sounds like elementary geometry modelling and meshing to me. Have you done the geometry and meshing tutorials? They are available on the ANSYS community webpage. If you want us to help you on your specific problem you will have to post some images of what you are trying to model.

July 20, 2017, 06:54		#3
turbo5 New Member Join Date: Jan 2016 Posts: 4 Rep Power: 10	Hi, thanks for the reply. I initially tried to solve this from a geometry/meshing approach, with little success. Ideally I would like to produce the mesh with TurboGrid as it is a simple way to get a good structured mesh. However, as far as I am aware I can only load one hub curve into it, which it would will only consider as a single surface. I also tried setting an inlet domain, which did split the surface in two, but as it was so close to the leading edge the mesh quality was very poor. I have also tried bringing the TurboGrid mesh into ICEM to split the surface but that didn't work either. I will try getting a few images put together when I get back to the office in a few days. Thanks

July 20, 2017, 06:56		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,694 Rep Power: 143	I am not an expert in Turbogrid so I cannot help you there. But you should be able to get geometries and/or meshes out of Turbogrid and into ICEM or DesignModeller and you can generate the other features there.