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April 3, 2007, 05:33 |
Hello,
i need help for a si
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#1 |
New Member
G Gruber
Join Date: Mar 2009
Location: Bavaria, Germany
Posts: 22
Rep Power: 17 |
Hello,
i need help for a simple example with OpenFOAM. Given: Inlet: Zylinder with Diameter 125mm (200mm long) A Inlet = D Inlet²*Pi/4 = 0,125² *3.14 / 4 = 0.0123m² Vpoint=2400l/min=0.04m³/s Fluid Oil: rho=0.9kg/dm³=900kg/m³ eta= 1 Pa s = 1 kg / (m s) Outlet: Zylinder with Diameter 200mm (200mm long) A Outlet = D Outlet²*Pi/4 = 0,2² *3.14 / 4 = 0.0314m² Necessary values for the calculation with OpenFOAM: v Inlet=Vpoint / A Inlet= 0.04 / 0.0123 = 3.25 m/s -> inscribed in $FOAM_RUN/tutorials/icoFoam/tube/0/U p Inlet= rho * v Inlet² / 2= 900 * 3,25² / 2 = 4753.125 Pa -> inscribed in $FOAM_RUN/tutorials/icoFoam/tube/0/p Re = D Inlet * v Inlet * rho / eta = 0,125 * 3.25 * 900 / 1 = 365,625 <re> laminar Flow -> Solver: icoFOAM ny = D Inlet * v Inlet / Re = 0,125 * 3.25 / 365,625 = 0.001 m² / s -> inscribed in $FOAM_RUN/tutorials/icoFoam/tube/constant/transportProperties endTime 0.5; deltaT 0.005; writeInterval 20 -> inscribed in $FOAM_RUN/tutorials/icoFoam/tube/system/controlDict div(phi,U) Gauss <>; changed in -> div(phi,U) Gauss linear; in $FOAM_RUN/tutorials/icoFoam/tube/system/fvSchemes: Requested values: v Outlet, p Outlet Calculated values for Control: v Outlet=v Inlet * A Inlet / A Outlet = 3.25 * 0.0123 / 0.0314 = 1,27 m/s p Outlet= rho * v Outlet² / 2= 900 * 1,27² / 2 = 725,805 Pa My problem is: The fact that the speed and Pressure is indicated only in the Inlet at the start time and not for all other times, it is also not to be recognised with the filter glyth. Sorry for the many postings the file-upload isn't very easy. tube.zip U p transportProperties controlDict fvSchemes |
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April 3, 2007, 06:47 |
Here are some pictures
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#2 |
New Member
G Gruber
Join Date: Mar 2009
Location: Bavaria, Germany
Posts: 22
Rep Power: 17 |
Here are some pictures
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April 3, 2007, 06:50 |
Sorry the size of the pictures
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#3 |
New Member
G Gruber
Join Date: Mar 2009
Location: Bavaria, Germany
Posts: 22
Rep Power: 17 |
Sorry the size of the pictures is to large for the board
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April 3, 2007, 07:26 |
Sounds like you need a support
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#4 |
Senior Member
Hrvoje Jasak
Join Date: Mar 2009
Location: London, England
Posts: 1,907
Rep Power: 33 |
Sounds like you need a support contract and not just "help".
Hrv
__________________
Hrvoje Jasak Providing commercial FOAM/OpenFOAM and CFD Consulting: http://wikki.co.uk |
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