Ansys CFX Turbogrid, Problem with blade leading edge sitting on hub at inlet

Irondome · January 15, 2014, 17:08

Hi friends,

I am still learning CFX Turbogrid and have completed examples.
I am given a blade profile of stator blade and when I input bladegen file, The geometry appers to be like the one in the image attached. The The leading edge of the blade is sitting on the hub and I am unable to define topology because the periodic surface to too close for O grid generation around the blade.

Can anyone please help me solve this problem ?

Thanks a lot

filippogalli · January 20, 2014, 09:38

Hi friend,

I don’t know if i understand your problem the right way. Looks like the upper right control point in your picture is too close to the blade edge. You can move it by clicking at it and then enter new coordinates (axial, radial normally). Should be discussed in one of the tutorials if I remember right.

Cheers!

Irondome · January 20, 2014, 19:26

Quote:

Originally Posted by filippogalli

Hi friend,

I don’t know if i understand your problem the right way. Looks like the upper right control point in your picture is too close to the blade edge. You can move it by clicking at it and then enter new coordinates (axial, radial normally). Should be discussed in one of the tutorials if I remember right.

Cheers!

Thanks a lot Flippogalli.
Problem solved.

Ahmed Saeed Mansour · August 18, 2016, 16:59

I have a negative volume mech...How can I solve it? Thanks

ghorrocks · August 18, 2016, 19:36

FAQ: http://www.cfd-online.com/Wiki/Ansys..._went_wrong.3F

Ahmed Saeed Mansour · August 18, 2016, 19:39

Thanks but the mesh cannot be updated sir.

ghorrocks · August 18, 2016, 19:44

The problem is in your mesh, so if you can't change your mesh then you are stuck.

Ahmed Saeed Mansour · August 18, 2016, 19:45

You mean I have to change the mesh settings from turbogrid?

ghorrocks · August 18, 2016, 19:54

Your mesh has turned inside out. CFX cannot work with a mesh like that and has no way of fixing it. You have to go back to whereever you made the mesh and fix it there.

(I am assuming that you are not using moving mesh and that the mesh was generated like this)

Ahmed Saeed Mansour · August 18, 2016, 19:56

What mesh? the picture is for the geometry in turbogrid...I have to control points to solve the problem..If you have any idea about that tell me...Thanks

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January 20, 2014, 09:38		#2
filippogalli New Member anonymous Join Date: Jan 2013 Posts: 3 Rep Power: 13	Hi friend, I don’t know if i understand your problem the right way. Looks like the upper right control point in your picture is too close to the blade edge. You can move it by clicking at it and then enter new coordinates (axial, radial normally). Should be discussed in one of the tutorials if I remember right. Cheers!

August 18, 2016, 19:36		#5
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,870 Rep Power: 144	FAQ: http://www.cfd-online.com/Wiki/Ansys..._went_wrong.3F

August 18, 2016, 19:39		#6
Ahmed Saeed Mansour Senior Member Have a nice time! Join Date: Feb 2016 Location: mech.eng.ahmedmansour@gmail.com Posts: 291 Rep Power: 11	Thanks but the mesh cannot be updated sir.

August 18, 2016, 19:44		#7
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,870 Rep Power: 144	The problem is in your mesh, so if you can't change your mesh then you are stuck.

August 18, 2016, 19:45		#8
Ahmed Saeed Mansour Senior Member Have a nice time! Join Date: Feb 2016 Location: mech.eng.ahmedmansour@gmail.com Posts: 291 Rep Power: 11	You mean I have to change the mesh settings from turbogrid?

August 18, 2016, 19:54		#9
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,870 Rep Power: 144	Your mesh has turned inside out. CFX cannot work with a mesh like that and has no way of fixing it. You have to go back to whereever you made the mesh and fix it there. (I am assuming that you are not using moving mesh and that the mesh was generated like this)

August 18, 2016, 19:56		#10
Ahmed Saeed Mansour Senior Member Have a nice time! Join Date: Feb 2016 Location: mech.eng.ahmedmansour@gmail.com Posts: 291 Rep Power: 11	What mesh? the picture is for the geometry in turbogrid...I have to control points to solve the problem..If you have any idea about that tell me...Thanks