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Search took 0.01 seconds. Search: Posts Made By: Ahmed Khattab
Forum: OpenFOAM Pre-Processing September 3, 2019, 05:48
Replies: 4
Views: 5,796
Posted By Ahmed Khattab
Hi Bruno, i think also that fields value (U,...

Hi Bruno,

i think also that fields value (U, p, T,...), and properties (K, DT,...) could be set to zones but not to sets. am i right?

thanks,
Ahmed
Forum: OpenFOAM February 2, 2019, 10:32
Replies: 19
Views: 59,133
Posted By Ahmed Khattab
Hi Bruno, thanks for your detailed...

Hi Bruno,

thanks for your detailed explanation.

But why both site claim that they own the OpenFOAM software.

- openfoam.org
- openfoam.com
claims that ESI group now own OpenCFD who...
Forum: OpenFOAM Post-Processing November 12, 2018, 13:58
Replies: 0
Views: 635
Posted By Ahmed Khattab
Simple utility interpolation method

Dear Foamers,

recently, i am working on a simulation. i have generated many models for my simulation. all with same geometry but with different dimension only "x-direction". after the simulation i...
Forum: OpenFOAM Running, Solving & CFD October 29, 2018, 07:48
Replies: 0
Views: 449
Posted By Ahmed Khattab
Question chage in results with change in boundary conditions

Dear Foamers,

i have a case of two channels beside each other. the separating wall is a porous media. flow enters from one end and exit from the other for both channels, of course with...
Forum: OpenFOAM Meshing & Mesh Conversion October 27, 2018, 14:55
Replies: 5
Views: 1,773
Posted By Ahmed Khattab
cells ordering influence on solution

Dear Foamers,

as far as i know,

1- cells are ordered in OpenFOAM based on axis directions.

i.e. cell number zero is the cell at the origin then number one next to it at x-axis and so on...
Forum: OpenFOAM Meshing & Mesh Conversion February 7, 2018, 09:36
Replies: 1
Views: 976
Posted By Ahmed Khattab
mesh independence

Hi Foamers,

in order to perform a mesh independence study, it is mandatory to use two meshes at least with different spacing, then compare one field or more through the different grids.

my...
Forum: OpenFOAM Running, Solving & CFD February 6, 2018, 18:20
Replies: 1
Views: 686
Posted By Ahmed Khattab
mesh independence

Hi Foamers,

in order to perform a mesh independence study, it is mandatory to use two meshes at least with different spacing, then compare one field or more through the different grids.

my...
Forum: OpenFOAM Running, Solving & CFD December 30, 2017, 16:02
Replies: 0
Views: 621
Posted By Ahmed Khattab
order of solution

Hi Foamers,

when i tried to study mesh independence, i found the papers of Roache, where he defined p as order of the method, which may be obtained by using three grids with constant refinement...
Forum: OpenFOAM Meshing & Mesh Conversion November 16, 2017, 15:25
Replies: 1
Views: 1,155
Posted By Ahmed Khattab
empty boundary condition

Hi all,

i have a question about using empty boundary condition. if i use empty boundary condition in z direction for example, should i make one cell only in z direction while establishing my mesh,...
Forum: OpenFOAM Running, Solving & CFD October 23, 2017, 12:07
Replies: 2
Views: 1,469
Posted By Ahmed Khattab
high aspecct ratio of cell dimensions

Hi All,

i have got a clue for my problem, although my mesh has no problems with orthogonality or skewness, there is a high aspect ratio between cell dimensions. that length of cell boundary in x...
Forum: OpenFOAM Pre-Processing October 23, 2017, 12:04
Replies: 3
Views: 1,573
Posted By Ahmed Khattab
cell aspect ratio

Hi All,

i have got a clue for my problem, although my mesh has no problems with orthogonality or skewness, there is a high aspect ratio between cell dimensions. that length of cell boundary in x...
Forum: OpenFOAM Pre-Processing October 23, 2017, 05:44
Replies: 3
Views: 1,573
Posted By Ahmed Khattab
suitable iteration number for steady state solve

Hi All,

i am using a steady state solver "simpleFoam", i know that solver stops when it either achieve tolerance limit or end time set in controlDict.

in my case the solver achieves...
Forum: OpenFOAM Running, Solving & CFD October 19, 2017, 16:37
Replies: 2
Views: 1,469
Posted By Ahmed Khattab
large number of iteration within time step

Dear Foamers,

i am working with porousSimpleFoam, in my case solver is taking about 32 iterations in one time step to solve velocity, but about 300 iterations to solve pressure. the time of one...
Forum: OpenFOAM Running, Solving & CFD August 5, 2017, 03:00
Replies: 37
Views: 34,877
Posted By Ahmed Khattab
Hi Ger_US According to d and f, you can say...

Hi Ger_US

According to d and f, you can say that d refers to Darian part of the Darcy-Forchheimer equation while f refers to Forchheimer part. So by comparing Darcy-Forchheimer equation by the...
Forum: OpenFOAM Running, Solving & CFD July 20, 2017, 10:23
Replies: 1
Views: 1,095
Posted By Ahmed Khattab
repeating the simulation with icoFoam

Hi there,

I have repeated the simulation using icoFoam solver, i have changed time step to get suitable Courant number, and it ran for 10 seconds.

at the end, i’ve got a parabolic profile of...
Forum: OpenFOAM Running, Solving & CFD July 19, 2017, 18:07
Replies: 1
Views: 1,095
Posted By Ahmed Khattab
Post convergence problem with simpleFoam

Hi All,

I am simulation a flow in a cylinder in order to get a velocity distribution at outlet, which i will use as inlet in another case.

in my current case, i'm using simleFoam, a wedge of a...
Forum: OpenFOAM Running, Solving & CFD July 14, 2017, 09:42
Replies: 1
Views: 996
Posted By Ahmed Khattab
long time for running porousSimpleFoam

Dear Foamers,

i am running a case using simplePorousFoam, with total mesh of 900.000 cells, i think that OpenFOAM takes a long time to run the case. this is a sample for first iteration.
Time =...
Forum: OpenFOAM Running, Solving & CFD July 7, 2017, 12:52
Replies: 0
Views: 584
Posted By Ahmed Khattab
Exclamation references for simplePorousFoam

Dear FOAMers,

i hope you are OK. i am about to write a paper, i have used simplePorousFoam. i need a reference to cite for how this solver works?, how it implements the Darcy equation in...
Forum: OpenFOAM Running, Solving & CFD October 13, 2016, 14:45
Replies: 11
Views: 3,937
Posted By Ahmed Khattab
Hi Cornelia, could you tell me how did you...

Hi Cornelia,

could you tell me how did you set membrane properties in transportProperties file?
Forum: OpenFOAM Running, Solving & CFD January 22, 2016, 18:19
Replies: 39
Views: 8,732
Posted By Ahmed Khattab
Hi Laurant, I think you have a problem with...

Hi Laurant,

I think you have a problem with your air velocity and pressure boundary conditions. Try converting inlet pressure and outlet velocity to zero gradient
Forum: OpenFOAM Running, Solving & CFD January 20, 2016, 13:59
Replies: 39
Views: 8,732
Posted By Ahmed Khattab
Please revise your boundary conditions. ...

Please revise your boundary conditions.

Also, please check user manual for max number of iterations setting, that you may set unintensionally.
Forum: OpenFOAM Running, Solving & CFD November 11, 2014, 15:05
Replies: 37
Views: 34,877
Posted By Ahmed Khattab
Hi, i use porous media in my model also. i...

Hi,

i use porous media in my model also. i searched a lot for answers for your question. really i don't have solid data but if you studies the two definitions you will find that a, b are factors...
Forum: OpenFOAM August 21, 2014, 12:37
Replies: 2
Views: 4,938
Posted By Ahmed Khattab
thanks elvis, for your reply, really appreciated.

thanks elvis, for your reply, really appreciated.
Forum: OpenFOAM August 16, 2014, 23:13
Replies: 2
Views: 4,938
Posted By Ahmed Khattab
mass transfer in OpenFOAM

Dear foamers,

i want to simulate a case of flowing of two solutions separated by membrane, it is well knon that there is analogy between heat and mass transfer, so i can use a solver which...
Forum: OpenFOAM Installation July 29, 2014, 14:30
Replies: 1
Views: 1,119
Posted By Ahmed Khattab
configuring OpenFOAM after updating of UBUNTU

Dear All,

could i reconfigure OpenFOAM after updating UBUNTU or i must reinstall it from the beginning.

thanks,
Showing results 1 to 25 of 182
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