[Madi]

Hi to all,

DanM I tried your boundary conditions for my openchannel and it works. Thanks for that. But now I've got an other problem. I want to beveling my geometry with a 20° square. And now my case dont get good results. There is a turbulence in the channel wich wasn't there before. I dont know how to fix the problem. I attaced my case files and some pictures to show my case. Please can anybody help me.

[Madi]

And my water level decreases to. Here are my files with the normal geometry.

[Saran16]

Hii Friends

Iam new to openfoam iam modelling a two phase flow in which water flows through one sideand air flows through the other how to determine that the liquids flows in their respective direction


Thank You

[Bodo1993]

Hi,
I am simulating 2D vertical channel flow (flow between two plates). Fluid 1 is initially filling the channel and Fluid 2 is injected to the domain from below.

I am getting some troubles at the outlet; the fluids exist just from some portion of the outlet (not the whole patch).

The boundary conditions I use at the outlet are:

U -> pressureInletOutletVelocity
P_rgh -> totalPressure with p0 = 0
phase -> inletOutlet

I would be grateful for any advice. Please let me know if further information is required.

Thanks.

[valdirene.rocho]

Good afternoon

I'm trying to simulate a biphasic flow (water/air) in openFoam (version 7) and I'm having a lot of difficulty regarding the boundary conditions to be used. Has anyone worked with this problem?

[vonboett]

Originally Posted by valdirene.rocho

Good afternoon

I'm trying to simulate a biphasic flow (water/air) in openFoam (version 7) and I'm having a lot of difficulty regarding the boundary conditions to be used. Has anyone worked with this problem?

sure, please explain your kind of problems or at least your kind of flow (simple geometry or compley geometry, defined inlet and outlet flow depth or ungnown/to be calculated, known discharge, known pressure in the air, turbulence reynolds number, size of domain)

[valdirene.rocho]

Hello

I would like to program a biphasic flow in openFoam in a permanent regime, very viscous (Re = 1). I thought it would be only in the fvSchemes folder to make changes to this item
ddtSchemes
{
default steadyState;
}
But it is not that way, it presents errors (see figure no link)

file:///C:/Users/Cliente/Desktop/fig2.JPG


Please, I need help!

[valdirene.rocho]

Good evening

Guys, I'm working with a two-phase flow (laminar) in openFoam 7 but I haven't managed to set the boundary conditions yet.
My advisor suggested using the boundary condition below:

type pressureDirectedInletOutletVelocity;
phi phi;
rho rho;
inletDirection uniform (1 0 0);
value uniform 0;

However, the following error appears:

FOAM FATAL IO ERROR:
Expected a '(' while reading VectorSpace<Form, Cmpt, Ncmpts>, found on line 41043 the label 0

file: /home/valdirene/Documentos/Estado_transiente/pressureDirectedInletOutletVelocity/0/U.boundaryField.saidaInferior.value at line 41043.

From function Foam::Istream& Foam::Istream::readBegin(const char*)
in file db/IOstreams/IOstreams/Istream.C at line 92.

FOAM exiting

Segmentation fault (core dumped)

Can someone help me? Whether using this boundary condition or how to fix the problem.

[valdirene.rocho]

Good evening

Guys, I'm working with a two-phase flow (laminar) in openFoam 7 but I haven't managed to set the boundary conditions yet.
My advisor suggested using the boundary condition below:

type pressureDirectedInletOutletVelocity;
phi phi;
rho rho;
inletDirection uniform (1 0 0);
value uniform 0;

However, the following error appears:

FOAM FATAL IO ERROR:
Expected a '(' while reading VectorSpace<Form, Cmpt, Ncmpts>, found on line 41043 the label 0

file: /home/valdirene/Documentos/Estado_transiente/pressureDirectedInletOutletVelocity/0/U.boundaryField.saidaInferior.value at line 41043.

From function Foam::Istream& Foam::Istream::readBegin(const char*)
in file db/IOstreams/IOstreams/Istream.C at line 92.

FOAM exiting

Segmentation fault (core dumped)

Can someone help me? Whether using this boundary condition or how to fix the problem.

[tomf]

Hi, try this:

type pressureDirectedInletOutletVelocity;
phi phi;
rho rho;
inletDirection uniform (1 0 0);
value uniform (0 0 0);

This is the velocity so use a vector.

Cheers,
Tom