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Turbine and Dynamic mesh

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Old   March 1, 2013, 13:35
Default Turbine and Dynamic mesh
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Marko Milasinovic
Join Date: Apr 2011
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I am working on piston turbine (2D) which is similar to gear pump. The gears are replaced by two pistons which rotates in opposite directions at 500 rpm.

I need to obtain flow field inside turbine. Because the region around pistons is deforming I used dynamic mesh for deforming surface. I wrote UDF for rotation moving of pistons. For deforming region I generated mesh using triangles which have size of 1 mm. The inlet pipe and outlet pipe are meshed using quads, size 5 mm. When I start to preview mesh motion after about 8 time steps I have skewness above 0.9. My step size is 1e-5. I have setup smooting and remeshing options and used default values.

I have attached some pictures.

Can anyone help me.

Attached Images
File Type: jpg turbine pic.1.jpg (55.3 KB, 13 views)
File Type: jpg turbine pic.2.jpg (36.6 KB, 9 views)
File Type: jpg turbine pic.3.jpg (96.4 KB, 8 views)
File Type: jpg turbine pic.4.jpg (99.6 KB, 5 views)
File Type: jpg turbine pic.5.jpg (97.2 KB, 6 views)
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