[gruber2]

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

[gruber2]

Here are some pictures

[gruber2]

Sorry the size of the pictures is to large for the board

[hjasak]

Sounds like you need a support contract and not just "help".

Hrv