piston bowl research with converge

OhLagrange · May 16, 2019, 07:15

hi,
I am doing research about piston bowl of diesel engine.There are some questions about the surface.dat. As the piston bowl could not be made through rotating a profile directly,I didn't use the tool named make engine sector surface.
When I imported stl file from other CAD software to CONVERGE,it appears "WARNING :areas of periodic boundaries 2 and 3 do not match. This may cause mass loss","periodic boundary area diff: 3.751019832262e-08".
Sometimes simulation completed,but most of cases just teminated without any tips in compression stroke.
Anybody can help me solve the problem?

Thanks.
Alex

yanggao · May 23, 2019, 11:09

the periodic boundaries should have exactly the same area

if warning message reports the difference in the areas of the two periodic boundaries

could you check your periodic boundaries 2 and 3 in the geometry? they seem mismatch

May 16, 2019, 07:15	piston bowl research with converge	#1
OhLagrange New Member zhang Alex Join Date: May 2019 Posts: 1 Rep Power: 0	hi, I am doing research about piston bowl of diesel engine.There are some questions about the surface.dat. As the piston bowl could not be made through rotating a profile directly,I didn't use the tool named make engine sector surface. When I imported stl file from other CAD software to CONVERGE,it appears "WARNING :areas of periodic boundaries 2 and 3 do not match. This may cause mass loss","periodic boundary area diff: 3.751019832262e-08". Sometimes simulation completed,but most of cases just teminated without any tips in compression stroke. Anybody can help me solve the problem? Thanks. Alex

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May 23, 2019, 11:09		#2
yanggao New Member Yang Gao Join Date: Jul 2018 Posts: 3 Rep Power: 7	the periodic boundaries should have exactly the same area if warning message reports the difference in the areas of the two periodic boundaries could you check your periodic boundaries 2 and 3 in the geometry? they seem mismatch