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Old   September 18, 1999, 21:54
Default Gambit
  #1
Suping Song
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Hello,

I am looking for help regarding to volume mesh generation using Gambit. The physical domain includes a vane and two end-walls, and the project is related to gas turbine industry.

Currently, I am able to generate surface meshes with good quality. However, some negative volumes are always created using cooper scheme in volume mesh generation(with attachment of bounday layers). I thinks that it is caused by a larger turning angle along the trailing edge of the vane. Another option is to use Teh/hybrid meshes, but I never made it.

I am grateful for your help and suggestions.

Regards,

Suping
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Old   September 19, 1999, 05:43
Default Re: Gambit
  #2
Jonas Larsson
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I've had similar problems meshing a 1.5 stage axial turbine in gambit. The surface boundary layers in Gambit are not very robust. If you have double curved surfaces, like a swept blade, you often get these negative volumes in the inner parts of the boundary layers. I've found a few tricks that helps sometimes:

Turn of smoothing when using the Cooper scheme

Play with different setting for the defaults associated with "normals".

If your picth is long it can help to divide it into different parts - create one or several surfaces or revolution around the axis and mesh each part separately. For example, if you divide your domain into two radial parts you can first mesh the central surface of revolution and then use this face as a source face when meshing with the Cooper scheme from hub to central and from central to shroud.

My experience with Gambit so far is that it is not very suitable for meshing of turbomachinery blades. I mainly use it when I want to include other parts also, like rim-seals and cavities. Fluent is coming out with a turbomachinery module to Gambit though. It will according to Fluent have a more robust boundary layer handling. Release date is scheduled to December, but my guess is that it'll take half a year or so after that before it is mature.
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Old   September 19, 1999, 11:05
Default Re: Gambit
  #3
John C. Chien
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(1). It is a good idea to try other codes which have the grid generation methods specifically designed for the turbomachinery. (2).There are at least two commercially available mesh generation codes in this area, such as Turbogrid of TASCflow. (3). The code provides the user several pre-defined templates for mesh generation. It is a block-structured mesh with simple grid stretching. (This is not a commercial, because I have used both Fluent and TASCflow series of codes extensively. We use Fluent here mainly for combustor flow calculations which normally requires multi-processor parallel processing.)
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Old   May 25, 2010, 14:34
Default schedule a mesh in gambit
  #4
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Eduardo Chavolla
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Location: Mexico City
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Edward! is on a distinguished road
Hi everyone

I want to schedule a mesh in gambit for a profile in 2D but I dont Know how to start someone could recommend me some book or suggestions please
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