[ata]

Hi
I think you can use groovy boundary condition and transform cylindrical cordinate to cartesian.
Good luck

Ata

[heavy_user]

Originally Posted by pradeeppandeygbpec

hello...all..
i need to prescribe parabolic velocity profile at inlet to a 3-D circular pipe . The pipe is along the x-Axis...ie. x-axis as its centerline.
I know the parabolic velocity profile for cylindrical coordinates system but how to implement the same in Cartesian coordinates....i need "u" as a function of x,y,z at inlet.
plz help me out...

Hi There,

i postet a while ago(further up somewhere) a "tool" that should be able to do that.
Just download and insert your equation...hope it works..

regards

[gascortado]

Hi. Does anyone have setParabolicInlet.C file previously posted? It is not available any more. If anyone can email it to gascortado@gmail.com I will greately appreciate it. Thanks

[ngj]

Hi

You would be better off considering the tool swak4foam: http://openfoamwiki.net/index.php/Contrib/swak4Foam

Have a nice weekend,

Niels

[kbambas]

Good morning evryone!
I 'm new in OpenFoam ,i want set parabolic inlet.I use the version 1.7.0. my geometry is a canal with attach in a tab.I have read in forom but i don't understand.
Please some help me to explain the procedure.
I try to english but my language is french.

[desert_1250]

Hi all, can every one tell me how to define U0=1-exp(-y^2) profile at the inlet BCs?


_____
Rasoul

[gschaider]

Originally Posted by desert_1250

Hi all, can every one tell me how to define U0=1-exp(-y^2) profile at the inlet BCs?

If you like C++-programming you can do it with codedFixedValue (only in 2.0). There was a discussion on that in the forum today

Or you can do it with groovyBC (now part of the swak4Foam-package). You find info about that either inthe Forum or on the Wiki

[desert_1250]

Originally Posted by gschaider

If you like C++-programming you can do it with codedFixedValue (only in 2.0). There was a discussion on that in the forum today

Or you can do it with groovyBC (now part of the swak4Foam-package). You find info about that either inthe Forum or on the Wiki

tanx for your reply, i have not any information about swak4Foam and not have enough time to study it, would you tell me the simplest way to set this BCs at the inlet? (i used OF.1.5-dev)

________
Rasoul

[gschaider]

Originally Posted by desert_1250

tanx for your reply, i have not any information about swak4Foam and not have enough time to study it, would you tell me the simplest way to set this BCs at the inlet? (i used OF.1.5-dev)

________
Rasoul

Unless you know the OpenFOAM-API by heart and program two boundary conditions every day (before breakfast) in my opinion groovyBC is the fastest way to get what you want (BTW: for your OF version you'll have to use "old school" groovyBC. Advantage: compilation is faster)

As you're very short on time: http://tinyurl.com/3fklrwd

[desert_1250]

Originally Posted by gschaider

Unless you know the OpenFOAM-API by heart and program two boundary conditions every day (before breakfast) in my opinion groovyBC is the fastest way to get what you want (BTW: for your OF version you'll have to use "old school" groovyBC. Advantage: compilation is faster)

As you're very short on time: http://tinyurl.com/3fklrwd

i successed to set the Bcs that i mentioned in the last posts by using nonuniform BCs. now i wanna to add osscillation to the inlet after reaching to the steady state. i know how to use oscillating bc, but dont know how to set it be continued from previous issue!!!??? on the other hand i wanna set unsteady BCs so that after a special time that the problem reached to the steady state, apply oscillation at the inlet. whoud you tell me how do it?? tanx

__________
Rasoul

[desert_1250]

can every one tell me how to exert (1-exp(-y^2)+0.5Cos2t) profile at the inlet BCs by groovy BCs?? i did not find any manual for groovyBC so that help me do it, i am very glad if intruduce me any documention a bout it.

_____
Rasoul

[gschaider]

Originally Posted by desert_1250

can every one tell me how to exert (1-exp(-y^2)+0.5Cos2t) profile at the inlet BCs by groovy BCs?? i did not find any manual for groovyBC so that help me do it, i am very glad if intruduce me any documention a bout it.

_____
Rasoul

You asked the same question in three threads in under an hour. Rule of thumb: usually this makes it LESS likely that anyone cares to answer. See also http://openfoamwiki.net/index.php/Ho..._Message_Board
(especially points 5&7)

[desert_1250]

tnx for your attention, you are right!!!
I've done my work with a combination of two other boundary conditions, without use groovyBC )

[alberto]

Ehhh...there are many examples on the download page of GroovyBC, so it's really a question of *reading* before asking.

[desert_1250]

Originally Posted by alberto

Ehhh...there are many examples on the download page of GroovyBC, so it's really a question of *reading* before asking.

you are right too someone else no idea ...

_______
Rasoul

[sihaqqi]

Hello Håkan

I am going through your tutorial. I am using OpenFoam 2.1. I am a beginner and freshly started learning openFoam. I cannot find parabolicvelocity folder and relevant files in the path.
parabolicVelocity/parabolicVelocityFvPatchVectorField.C
parabolicVelocity/parabolicVelocityFvPatchVectorField.H

Can you please send them at sihaqqi@gmail.com. I shall be very grateful. I have tried to find them on internet but every link is useless.

Thanks and Regards

[wyldckat]

Originally Posted by sihaqqi

I am going through your tutorial. I am using OpenFoam 2.1. I am a beginner and freshly started learning openFoam. I cannot find parabolicvelocity folder and relevant files in the path.
parabolicVelocity/parabolicVelocityFvPatchVectorField.C
parabolicVelocity/parabolicVelocityFvPatchVectorField.H

FYI: The way to get those files and build them (for any OpenFOAM version) is fully explained here: http://www.cfd-online.com/Forums/ope...tml#post446451 post #10

[shivab]

Hello!

I am trying to give a parabolic velocity profile at the inlet.
I got the default code from Ansys fluent manual, how can I adjust it such as I get a particular velocity at inlet. Initially, I have taken up the code and interpreted and during initialization, I gave the velocity required.

Here is the code I used and any suggestions regarding the improvement of the code to get a required velocity?:

#include "udf.h"
DEFINE_PROFILE(x_velocity,thread,index)
{
real x[ND_ND];
real y;
face_t f;
begin_f_loop(f,thread)
{
F_CENTROID(x,f,thread);
y = x[1];
F_PROFILE(f,thread,index) = 20. - y*y/(.0745*.0745)*20.;
}
end_f_loop(f,thread)
}

Regards,
Shiva