CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > OpenFOAM > OpenFOAM Running, Solving & CFD

Need help for a simple example with icoFOAM

Register Blogs Members List Search Today's Posts Mark Forums Read

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   April 3, 2007, 05:33
Default Hello, i need help for a si
  #1
New Member
 
G Gruber
Join Date: Mar 2009
Location: Bavaria, Germany
Posts: 22
Rep Power: 17
gruber2 is on a distinguished road
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 is offline   Reply With Quote

Old   April 3, 2007, 06:47
Default Here are some pictures
  #2
New Member
 
G Gruber
Join Date: Mar 2009
Location: Bavaria, Germany
Posts: 22
Rep Power: 17
gruber2 is on a distinguished road
Here are some pictures




gruber2 is offline   Reply With Quote

Old   April 3, 2007, 06:50
Default Sorry the size of the pictures
  #3
New Member
 
G Gruber
Join Date: Mar 2009
Location: Bavaria, Germany
Posts: 22
Rep Power: 17
gruber2 is on a distinguished road
Sorry the size of the pictures is to large for the board
gruber2 is offline   Reply With Quote

Old   April 3, 2007, 07:26
Default Sounds like you need a support
  #4
Senior Member
 
Hrvoje Jasak
Join Date: Mar 2009
Location: London, England
Posts: 1,907
Rep Power: 33
hjasak will become famous soon enough
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
hjasak is offline   Reply With Quote

Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Density in icoFoam Densidad en icoFoam manuel OpenFOAM Running, Solving & CFD 8 September 22, 2010 05:10
About Phase Coupled SIMPLE (PC-SIMPLE) algorithm Yan Kai Main CFD Forum 0 April 18, 2007 04:48
About Phase Coupled SIMPLE (PC-SIMPLE) algorithm Yan Kai FLUENT 0 April 14, 2007 00:17
Need help for a simple example with icoFOAM gruber2 OpenFOAM Running, Solving & CFD 0 April 3, 2007 05:20


All times are GMT -4. The time now is 05:18.