[dfhjartarson]

Hi!

So, I am trying to setup a calm water simulation of a floating hull.
Since I have little experience with OpenFoam so far, I decided to start off with the DTC Hull example / tutorial provided with OpenFoam. My line of though was to just swap the DTC hull out for a hull I am interested in analysing and take things from there.
That has however proven tougher than I expected..

See attached image for the initial scene (marked T0). Here I've set a scalar clip filter on alpha_water at 0.34.

I've tried playing around with the initial height of the water in setFields but without luck.

Here's my the content of my setFields file:

defaultFieldValues
(
volScalarFieldValue alpha.water 0
);

regions
(
// Set cell values
// (does zerogradient on boundaries)
boxToCell
{
box (-999 -999 -999) (999 999 0.15); //box (-999 -999 -999) (999 999 0.244);

fieldValues
(
volScalarFieldValue alpha.water 1
);
}

// Set patch values (using ==)
boxToFace
{
box (-999 -999 -999) (999 999 -1);

fieldValues
(
volScalarFieldValue alpha.water 1
);
}
);

The simulation runs for a little bit (0.0009 seconds), but the behaviour is just weird.. I've attached another photo of the end result (marked T00009). Again just Alpha_water.

The error I get from InterFoam is:

Primary job terminated normally, but 1 process returned
a non-zero exit code. Per user-direction, the job has been aborted.

Is there a way I can see errorlogs form each individual process? Should I maybe run the simulation not in parallel to get the error?

I know it might not be a lot of details I'm providing, but that is simply because I'm a little lost.

Any ideas? I'll happily provide further information.
Thanks in advance.

[pferro]

Originally Posted by dfhjartarson

Hi!

So, I am trying to setup a calm water simulation of a floating hull.
Since I have little experience with OpenFoam so far, I decided to start off with the DTC Hull example / tutorial provided with OpenFoam. My line of though was to just swap the DTC hull out for a hull I am interested in analysing and take things from there.
That has however proven tougher than I expected..

See attached image for the initial scene (marked T0). Here I've set a scalar clip filter on alpha_water at 0.34.

I've tried playing around with the initial height of the water in setFields but without luck.

Here's my the content of my setFields file:


The simulation runs for a little bit (0.0009 seconds), but the behaviour is just weird.. I've attached another photo of the end result (marked T00009). Again just Alpha_water.

The error I get from InterFoam is:

Is there a way I can see errorlogs form each individual process? Should I maybe run the simulation not in parallel to get the error?

I know it might not be a lot of details I'm providing, but that is simply because I'm a little lost.

Any ideas? I'll happily provide further information.
Thanks in advance.

Hello,


You have very likely a problem of mesh size.
Are you sure that your hull fit well in the DTC tutorial ?
By the way why a clip at alpha = 0.34 ?



Could you please give more information ? : mesh view, checkMesh, initial condition etc..



Paulin

[dfhjartarson]

Hi PFerro,

thank you very much for the reply!

To answer your question regarding the clip of 0.34. To be frank, in my ignorance I just pulled the slider to somewhere between 0 and 1, it happened to land on .34. Maybe that is bad practice?

I've added the output of checkMesh. There are some skewed surfaces.

I've also attached an image of a size comparison of the DTC hull (blue) and the hull I'm interested in analysing (green).

I've also added a couple of screenshots of the mesh view of the hull. I don't know, is there a particular area of interest you'd need to see or can you maybe already see something odd from these images?