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Pipe flow simulation problem with pisoFoam: not getting parabolic profile |
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September 7, 2016, 13:21 |
Pipe flow simulation problem with pisoFoam: not getting parabolic profile
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#1 |
Member
Sheikh Ahmed
Join Date: Dec 2015
Location: South Carolina, USA
Posts: 88
Rep Power: 11 |
Dear Foamers
I am trying to simulate a simple 3D pipe flow with a wedge-shaped geometry using pisoFoam>ras>cavity solver. The reason I am using piso, not ico is that, I have to use another solver with chemical kinetics which uses Piso as its base flow solver. My flow is laminar with an inlet velocity of 0.1384 m/s, tube length 355mm, tube radius 42mm with a slanted part at the inlet (the geometry with the boundaries mentioned is attached with this post). Since my flow is laminar, in the constant>RASProperties.RASModel, I put 'laminar' with unchanged turbulenceProperties and transportProperties- RASProperties: FoamFile { version 2.0; format ascii; class dictionary; location "constant"; object RASProperties; } // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // RASModel laminar; //kEpsilon; turbulence off; printCoeffs off; // ************************************************** *********************** // turbulenceProperties: FoamFile { version 2.0; format ascii; class dictionary; location "constant"; object turbulenceProperties; } // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // simulationType RASModel; transportProperties: // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // transportModel Newtonian; nu nu [ 0 2 -1 0 0 0 0 ] 1e-05; CrossPowerLawCoeffs { nu0 nu0 [ 0 2 -1 0 0 0 0 ] 1e-06; nuInf nuInf [ 0 2 -1 0 0 0 0 ] 1e-06; m m [ 0 0 1 0 0 0 0 ] 1; n n [ 0 0 0 0 0 0 0 ] 1; } BirdCarreauCoeffs { nu0 nu0 [ 0 2 -1 0 0 0 0 ] 1e-06; nuInf nuInf [ 0 2 -1 0 0 0 0 ] 1e-06; k k [ 0 0 1 0 0 0 0 ] 0; n n [ 0 0 0 0 0 0 0 ] 1; } Since I dont have turbulence, I didnt change any value of epsilon, k, nut and nuTilda in the 0 folder and I just put my pressure (P/rho) and velocity conditions- FoamFile { version 2.0; format ascii; class volScalarField; object p; } // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // dimensions [0 2 -2 0 0 0 0]; internalField uniform 85654.5; boundaryField { inlet { type zeroGradient; } outlet { type fixedValue; value uniform 85654.5; } frontwall { type zeroGradient; } outerwall { type zeroGradient; } axisym_f1 { type wedge; } axisym_f2 { type wedge; } } FoamFile { version 2.0; format ascii; class volVectorField; object U; } // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // dimensions [0 1 -1 0 0 0 0]; internalField uniform (0.01311 0 0); boundaryField { inlet { type fixedValue; value uniform (0.138475 0 0); } outlet { type zeroGradient; } frontwall { type fixedValue; value uniform (0 0 0); } outerwall { type fixedValue; value uniform (0 0 0); } axisym_f1 { type wedge; } axisym_f2 { type wedge; } } My problem is, I am not getting a parabolic profile even after running for a longer time and the jet from the inlet is not breaking rather it is moving forward on and on. The recirculation bubble is also moving/stretching with the flow. This is definitely wrong. Do you have any idea why this is happening? PLEASE share any of your experience of suggestion. Thanks in advance |
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September 7, 2016, 15:00 |
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#2 |
Member
Sheikh Ahmed
Join Date: Dec 2015
Location: South Carolina, USA
Posts: 88
Rep Power: 11 |
Any of your suggestion will be highly appreciated. Please share if you faced similar problems.
~SFA |
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Tags |
jet breakup, laminar flow, pipe flow, pisofoam, wedge type |
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