[Aneirin]

Hello,

I am trying to model the (subsonic compressible) flow over a moving object (like an airfoil). In Fluent, one can specify FarField boundary conditions, but I can not find something similar in OpenFOAM, at first glance (I looked through the source code for Derived Types, as mentioned in the Manual).

Has anyone succesfully completed such a simulation - and which boundary conditions did you use to do so? Details with regard to such simulations seem very scarce, I looked in numerous places.

Help would certainly be appreciated.

[fletc900]

Hi there,

There is the "freestream" patch type. Take a look at the airfoil2D example under the simpleFoam directory for the tutorials that uses a c-mesh. In the 0/ directory, for the U file (and other variable files) , you should have something like:

boundaryField
{
inlet
{
type freestream;
freestreamValue uniform (43.71427 3.05657365 0); // angle of attack = 4 deg
}

outlet
{
type freestream;
freestreamValue uniform (43.71427 3.05657365 0);
}

wall
{
type fixedValue;
value uniform (0 0 0);
}

frontAndBack
{
type empty;
}
}

Cheers

[BSengupta]

Hi, I am too new to OF. I have a spherical mesh in which a plate is placed which is made in Pointwise. I have two BC one is wall and the other is far field. I have written as below:



farfield
{
type freestream;
value uniform (48 95 27.5);
}

wall
{
type noSlip;
}



I am encountering the error:

"--> FOAM FATAL IO ERROR:
Cannot find patchField entry for inlet

file: /home/bidesh/OpenFOAM/bidesh-6/run/prism/0/p.boundaryField from line 26 to line 32.

From function void Foam::GeometricField<Type, PatchField, GeoMesh>::Boundary::readField(const Foam:imensionedField<TypeR, GeoMesh>&, const Foam::dictionary&) [with Type = double; PatchField = Foam::fvPatchField; GeoMesh = Foam::volMesh]
in file /home/ubuntu/OpenFOAM/OpenFOAM-6/src/OpenFOAM/lnInclude/GeometricBoundaryField.C at line 191.

FOAM exiting"


Any help shall be very helpful to me. Thank you.

[charan3007]

did you your problem got solved cause i am also facing same issue

[Sakun]

Originally Posted by charan3007

did you your problem got solved cause i am also facing same issue

Hi,



Did you solve your issue ? i am having the same