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Modeling leakage through surface asperities

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Old   November 16, 2016, 18:54
Default Modeling leakage through surface asperities
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Ahmed Jalal
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All,

I hope you are doing well. I was wondering if someone had ever simulated flow through surface asperities (gaps) that are a result of surface roughness. I know that these asperities are usually on the micro-level.

I am doing a project regarding leakage though metal-to-metal gaskets in API flanges to determine the leak rate in different surface properties.

Would like to start a discussion if anyone has previous experience with this type of simulations. I am indifferent to using either ANSYS Fluent 17 or Star CCM+ 11

Best regards,
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Old   November 16, 2016, 19:06
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Michael Prinkey
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Quote:
Originally Posted by A.Jalal View Post
All,

I hope you are doing well. I was wondering if someone had ever simulated flow through surface asperities (gaps) that are a result of surface roughness. I know that these asperities are usually on the micro-level.

I am doing a project regarding leakage though metal-to-metal gaskets in API flanges to determine the leak rate in different surface properties.

Would like to start a discussion if anyone has previous experience with this type of simulations. I am indifferent to using either ANSYS Fluent 17 or Star CCM+ 11

Best regards,
You might look at using the porous media models. You may be able to mesh a thin layer of porous media to represent the gap and use the roughness details to work out a porosity. If your layer is going to be very thin, make sure to use the double precision solvers.

Good luck.
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Old   November 30, 2016, 01:45
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Ahmed Jalal
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I was thinking more like generating a random 3D surface and attaching those node locations to the CAD model. Porous media would not take into account the surface roughness but that is a good way of modelling dynamic contacts.
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gasket, leakage, leaking boundary, surface roughness

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