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Continuity error cannot be removed by adjusting the outflow.

Hi all,

I am a new OpenFOAM user. Now I am trying to simulate a case relating heat transfer. I choose buoyantsimplefoam for my case. I think all is ok except defining the pressure boundary conditions. Here are the velocity and pressure boundary conditions for my case. Is there any problem with defining pressure relating to the above velocity boundary conditions? Thanks in advance. 

When I simulate my case I face the continuity error like that
Continuity error cannot be removed by adjusting the outflow.
Please check the velocity boundary conditions and/or run potentialFoam to initialise the outflow.
Total flux : 4.18896e-05
Specified mass inflow : 0.00269453
Specified mass outflow : 0
Adjustable mass outflow : 0
U/Velocity
dimensions [0 1 -1 0 0 0 0];
internalField uniform (0 0 0);
boundaryField
{
cold
{
type fixedValue;
value uniform (0 0 0);
}
hot
{
type fixedValue;
value uniform (0 0 0);
}
top
{
type fixedValue;
value uniform (0 0 0);
}
bottom
{
type zeroGradient;//fixedValue;
//value uniform (0 0 0);
}
front
{
type fixedValue;
value uniform (0 0 0);
}
back
{
type fixedValue;
value uniform (0 0 0);
}
Jet
{
type fixedValue;
value uniform (0 -0.1 0);
}
}
pressure-p
dimensions [1 -1 -2 0 0 0 0];
internalField uniform 1e5;
boundaryField
{
cold
{
type calculated;//zeroGradient;
value $internalField;
}
hot
{
type calculated;//zeroGradient;
value $internalField;
}
top
{
type calculated;//zeroGradient;
value $internalField;
}
bottom
{
type fixedValue;
value uniform 1e5;
}
front
{
type calculated;//zeroGradient;
value $internalField;
}
back
{
type calculated;//zeroGradient;
value $internalField;
}
Jet
{
type zeroGradient;
// value uniform 1e5;
}
}
Dynamic pressure-pgh
dimensions [1 -1 -2 0 0 0 0];
internalField uniform 1e5;
boundaryField
{
cold
{
type fixedFluxPressure;
value uniform 1e5;
}
hot
{
type fixedFluxPressure;
value uniform 1e5;
}
top
{
type fixedFluxPressure;
value uniform 1e5;
}
bottom
{
type fixedFluxPressure;
value uniform 1e5;
}
front
{
type fixedFluxPressure;
value uniform 1e5;
}
back
{
type fixedFluxPressure;
value uniform 1e5;
}
Jet
{
type zeroGradient;
//value uniform 1e5;
}
}


OpenFOAM 19-09-18, 1:22 p.m. razon131211

Answers:

1

Hi,
Can you please share the case directory.

19-09-18, 2:36 p.m. sathish

Hi Satish,

Yes, I can. There are a lot of files inside the case directory. But in this site, I was unable to find any doc attaching options. This has the only option for image attachment. How can I share with you?


20-09-18, 5:07 a.m. razon131211

If you have not any problem, I can share these file by email. Please let me know how you go.


20-09-18, 11:46 a.m. razon131211

Send the case directory with only 0, constant and system folders. Send it to cfdfossee@gmail.com


20-09-18, 7:02 p.m. sathish

Hi Satish,

Please check your mail. I sent my case files to your email.


21-09-18, 5:21 a.m. razon131211

Hi Satish,

Can you check that files? Sorry for bothering. Actually, I am a little bit hurry about that simulations as I have to go further after that case.


24-09-18, 5:02 a.m. razon131211

Hi,
I checked your case directory. What is the patch called Jet, which is not defined in blockMeshDict?. If possible can you send an image of your geometry


24-09-18, 11:34 a.m. sathish

Thank you, Satish. please check your mail. I already sent it to your email.


24-09-18, 12:07 p.m. razon131211

Here are the details what I am trying to do.

My geometry shape is like a cavity. Actually, I am trying to push the air from Patch Field called "Jet" inside the cavity while the left wall of the cavity is hot and the right wall is cold. Other walls are defined in the blockMeshdict file. I did it for the icoFoam case. But when I go for buoyantSimpleFoam. It shows the continuity error. I think it will help you to fix the problem.


24-09-18, 12:16 p.m. razon131211

Please check your email. I also sent icoFoam case files to you which is working fine.


24-09-18, 12:32 p.m. razon131211

so after blockMesh command do you type topoSet command?


24-09-18, 2:59 p.m. sathish

The command lines are as follows,

blockMesh
topoSet
createPatch -overwrite
buoyantSimpleFoam
paraFoam


25-09-18, 7 a.m. razon131211

Did you check the files by this command lines?


26-09-18, 9:49 a.m. razon131211

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