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Forum: OpenFOAM Running, Solving & CFD

October 7, 2009, 01:48

Replies: 132

Hydrostatic Pressure and Gravity

Views: 37,763

Posted By ngj

Hi Kjetil One thought. Could it be that the...

Hi Kjetil

One thought. Could it be that the compressibility needs to have the total pressure, hence a negative pressure would suggest something being un-physical. Try setting the pressure at the...

Forum: OpenFOAM Running, Solving & CFD

October 5, 2009, 02:22

Replies: 132

Hydrostatic Pressure and Gravity

Views: 37,763

Posted By ngj

Try setting pMin to some large negative value,...

Try setting pMin to some large negative value, e.g. -1e10, and see if you can solve the problem using compressibleInterfoam.

Bests

Niels

Forum: OpenFOAM Running, Solving & CFD

October 4, 2009, 16:17

Replies: 132

Hydrostatic Pressure and Gravity

Views: 37,763

Posted By ngj

Hi Kjetil I have looked at your setup, and...

Hi Kjetil

I have looked at your setup, and the reason behind your strange results might be due to several things, or more likely a combination of the items below.

1. You specify a pressure at...

Forum: OpenFOAM Running, Solving & CFD

October 4, 2009, 14:17

Replies: 132

Hydrostatic Pressure and Gravity

Views: 37,763

Posted By ngj

Hi Kjetil I am not aware of any other...

Hi Kjetil

I am not aware of any other solver. However, if you are can share your setup, I will try to give it a look and see, if I can spot where this un-physical pressure originates from.
...

Forum: OpenFOAM Running, Solving & CFD

October 4, 2009, 13:49

Replies: 132

Hydrostatic Pressure and Gravity

Views: 37,763

Posted By ngj

Hi Kjetil It looks very unphysical to my, as...

Hi Kjetil

It looks very unphysical to my, as it should be impossible to change the direction of the flow in the bend without having a resulting force [1], hence are you sure that you are using the...

Forum: OpenFOAM Running, Solving & CFD

October 4, 2009, 12:29

Replies: 132

Hydrostatic Pressure and Gravity

Views: 37,763

Posted By ngj

Hi Kjetil As an easy fix, there are three...

Hi Kjetil

As an easy fix, there are three possible solutions to this:

1. If readEnvironmentalProperties.H is still present in 1.6, then find this new location and source it.
2. Copy...

Forum: OpenFOAM Running, Solving & CFD

July 12, 2009, 08:50

Replies: 132

Hydrostatic Pressure and Gravity

Views: 37,763

Posted By ngj

Hi Mark I see that I forgot to include some...

Hi Mark

I see that I forgot to include some informations.

The curve "Relaxation" is based on your tutorial with updates every 5 time steps and the standard relaxation parameters, whereas "No...

Forum: OpenFOAM Running, Solving & CFD

July 10, 2009, 04:56

Replies: 132

Hydrostatic Pressure and Gravity

Views: 37,763

Posted By ngj

Hi Mark I have made some progress, and I...

Hi Mark

I have made some progress, and I have found a method to update the mesh without the need of any relaxation and better behaviour in gamma. Up to now I have been working with periodic mesh...

Forum: OpenFOAM Running, Solving & CFD

June 16, 2009, 15:32

Replies: 132

Hydrostatic Pressure and Gravity

Views: 37,763

Posted By ngj

Hi Mark Thanks for your quick reply. I...

Hi Mark

Thanks for your quick reply. I actually found the SIG earlier, and I have now joined the mailing-list.
Just to help narrowing down the problems, I have used cGamma = 1 up to now, thus...

Forum: OpenFOAM Running, Solving & CFD

June 16, 2009, 13:25

Replies: 132

Hydrostatic Pressure and Gravity

Views: 37,763

Posted By ngj

Hi Mark and Velan @Velan: I can easily...

Hi Mark and Velan

@Velan: I can easily answer your question, as I can recognize the input, and I believe Mark has been using my wave generation tool. Unfortunately I have removed the tool from my...

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