Gambit Axisymmetric Neutral File Problem

SandyS · August 20, 2010, 10:51

Hello,

I am trying to convert an axisymmetric mesh from a Gambit mesh to OpenFoam. I have created a wedge-shaped 3-D model of a nozzle in Gambit, and have created all the 2D boundaries: inlet, outlet, frontAndBack, and top (= 5 degree curved outer surface of the nozzle). I also created a 1D boundary called "axis" from the edges along the axis of symmetry.

However, when I export a neutral file (*.neu) from Gambit (solver set to "generic") to convert to OpenFoam, it does not export the axis boundary element properly, and gives an error "Boundary entity axis does not contain any valid entity and is not written." The .neu file created has all the other boundaries defined, but not axis.

Can anyone help?
Thanks,
Sandy

mirko · August 30, 2010, 17:42

Quote:

Originally Posted by SandyS

Hello,

I am trying to convert an axisymmetric mesh from a Gambit mesh to OpenFoam. I have created a wedge-shaped 3-D model of a nozzle in Gambit, and have created all the 2D boundaries: inlet, outlet, frontAndBack, and top (= 5 degree curved outer surface of the nozzle). I also created a 1D boundary called "axis" from the edges along the axis of symmetry.

However, when I export a neutral file (*.neu) from Gambit (solver set to "generic") to convert to OpenFoam, it does not export the axis boundary element properly, and gives an error "Boundary entity axis does not contain any valid entity and is not written." The .neu file created has all the other boundaries defined, but not axis.

Can anyone help?
Thanks,
Sandy

My Gambit axisymmetric geometry did not include the 1D axial boundary. Conversion to OF and simulation went fine. So you may want to delete that boundary and proceed without it.

Mirko

SandyS · October 14, 2010, 15:43

Hi Mirko,

Thanks for your reply, and sorry to take so long getting back to you. I will give your suggestion a try, but I think that is where I started, with no 1-D boundary along the axis. I'll have to check.

Cheers,
Sandy

palmerlee · March 25, 2014, 08:01

Hi, Mirko!

How do you convert a gambit mesh to OpenFOAM axisymmetric mesh? Is your gambit mesh a wedge-shaped 3-D mesh or a 2-D mesh?

Kind regards,
Peter

palmerlee · March 25, 2014, 08:08

Hi, Mirko!

How do you convert a gambit mesh to OpenFOAM axisymmetric mesh? Is your gambit mesh a wedge-shaped 3-D mesh or a 2-D mesh?

Kind regards,
Peter

August 20, 2010, 10:51	Gambit Axisymmetric Neutral File Problem	#1
SandyS New Member Sandy Stewart Join Date: Aug 2010 Posts: 2 Rep Power: 0	Hello, I am trying to convert an axisymmetric mesh from a Gambit mesh to OpenFoam. I have created a wedge-shaped 3-D model of a nozzle in Gambit, and have created all the 2D boundaries: inlet, outlet, frontAndBack, and top (= 5 degree curved outer surface of the nozzle). I also created a 1D boundary called "axis" from the edges along the axis of symmetry. However, when I export a neutral file (*.neu) from Gambit (solver set to "generic") to convert to OpenFoam, it does not export the axis boundary element properly, and gives an error "Boundary entity axis does not contain any valid entity and is not written." The .neu file created has all the other boundaries defined, but not axis. Can anyone help? Thanks, Sandy

October 14, 2010, 15:43	Gambit Problems	#3
SandyS New Member Sandy Stewart Join Date: Aug 2010 Posts: 2 Rep Power: 0	Hi Mirko, Thanks for your reply, and sorry to take so long getting back to you. I will give your suggestion a try, but I think that is where I started, with no 1-D boundary along the axis. I'll have to check. Cheers, Sandy

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March 25, 2014, 08:01		#4
palmerlee Member Peter Join Date: Nov 2011 Posts: 46 Rep Power: 15	Hi, Mirko! How do you convert a gambit mesh to OpenFOAM axisymmetric mesh? Is your gambit mesh a wedge-shaped 3-D mesh or a 2-D mesh? Kind regards, Peter

March 25, 2014, 08:08		#5
palmerlee Member Peter Join Date: Nov 2011 Posts: 46 Rep Power: 15	Hi, Mirko! How do you convert a gambit mesh to OpenFOAM axisymmetric mesh? Is your gambit mesh a wedge-shaped 3-D mesh or a 2-D mesh? Kind regards, Peter