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NEGETIVE VOLUME

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Old   December 29, 2006, 08:14
Default NEGETIVE VOLUME
  #1
ammi reddy
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Hi i am modeling reciprocating compressor by dynamic meshing (cylinder piston arrangement).

lenght of compressor is=0.0075m radius=r=0.00954m

my udf function for piston is

frequency = f=34hz w=2*Pi*f=213.62rad/s displacement of piston is X= 4.511e-3m piston head velocity =V= 0.9631Cos(w t) i am taking time step=dt= 7.3529e-4s no of time steps = 40 I am getting negative volume problem as follow

Error: Update-Dynamic-Mesh failed. Negative cell volume detected. Error Object: ()

How to solve this problem.Waiting for your kind suggestions? ammi reddy

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Old   January 3, 2007, 08:10
Default Re: NEGETIVE VOLUME
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kais
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Hi Ammi, check your cell sizes in respect to the moving wall velocity. usually you get the statement as soon as the moving cellwall and the stationary wall overlap. kais
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