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Mass Increase for closed system with moving wall

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Old   January 21, 2009, 16:00
Default Mass Increase for closed system with moving wall
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Evan
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My issue is with a closed system filled with an ideal gas. It is a 2D axisymmetric model which also includes a moving wall representing a pressure wave generator or piston-cylinder assembly. The problem is the system's mass is steadily increasing. I have tried several variations on modeling the moving wall using various smoothing techniques. I am certain the moving mesh and its UDF is working properly with visual reference, however I believe the code is somehow adding mass on the back stroke.

Any help would be greatly appreciated. Thanks.
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Old   June 8, 2012, 03:20
Question Coupled Flow _ Rigid Body Motion - Battery Cooling
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Simon
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Hello,
I have the same problem.
My mass flow rate is alternating increasing up to 700%.
The Residuals seems to be ok, but Tke and Tdr pass up quick above 1.
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Old   April 21, 2015, 15:14
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sanjeet Limbu
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I am getting no pressure and temperature rise for rapid compression in fluid 2D axi-symetric acse

I have entered these values at initialisation

Problem is that I am not geting temp and pressure rise during compression stroke
Attached Images
File Type: jpg dynamic mesh compression.jpg (21.7 KB, 2 views)
File Type: jpg CFD post view for pressuree contour.jpg (27.9 KB, 3 views)
File Type: jpg operating and initial values.jpg (33.9 KB, 3 views)
File Type: jpg species model.jpg (59.1 KB, 3 views)
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