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April 15, 2010, 12:12 |
flowRateInletVelocity compressible
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#1 |
New Member
Oli
Join Date: Apr 2009
Posts: 27
Rep Power: 17 |
Hello world!
I have a question about the unit of the inlet boundary flowRateInletVelocity. When using an incompressible solver like simpleFoam, the flowRate is given in [ m³/s ]. Which unit is given when using a compressible solver, for example buoyantPisoFoam? Is is it still [m³/s] or then [kg/s] ? Best Regards |
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April 15, 2010, 12:44 |
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#2 |
Member
Cedric Van Holsbeke
Join Date: Dec 2009
Location: Belgium
Posts: 81
Rep Power: 16 |
Your question is answered in the following part of flowRateInletVelocityFvPatchVectorField.C:
Code:
00129 if (phi.dimensions() == dimVelocity*dimArea) 00130 { 00131 // volumetric flow-rate 00132 operator==(n*avgU); 00133 } 00134 else if (phi.dimensions() == dimDensity*dimVelocity*dimArea) 00135 { 00136 const fvPatchField<scalar>& rhop = 00137 patch().lookupPatchField<volScalarField, scalar>(rhoName_); 00138 00139 // mass flow-rate 00140 operator==(n*avgU/rhop); 00141 } |
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April 16, 2010, 03:56 |
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#3 |
Member
Cedric Van Holsbeke
Join Date: Dec 2009
Location: Belgium
Posts: 81
Rep Power: 16 |
I was indeed correct:
Incompressible solver: phi is in m^3/s --> flowRateInletVelocity is in m^3/s Compressible solver: phi is in kg/s --> flowRateInletVelocity is in kg/s |
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August 27, 2010, 05:31 |
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#4 |
Senior Member
Nilesh Rane
Join Date: Apr 2010
Posts: 122
Rep Power: 16 |
I didnt get this concept. How i suppose to give the mass flow rate value, for the same case, when i am solving with incompressible solver and with compresible solver??? Say i have a mass flow rate of 5kg/s through an inlet. can anyone elaborate please???
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August 27, 2010, 05:42 |
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#5 |
Member
Cedric Van Holsbeke
Join Date: Dec 2009
Location: Belgium
Posts: 81
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Assuming that you use a fluid with the density of water (rho = 1000 kg/m³) and you want to achieve a mass flow rate of 5kg/s, you will have to fill in this value for the flowRate:
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August 27, 2010, 05:56 |
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#6 |
Senior Member
Nilesh Rane
Join Date: Apr 2010
Posts: 122
Rep Power: 16 |
Oh..gotcha...
Thanks Cedric for the quick reply..Have a good day..
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