[ndabir]

Hey all,

I am doing a moving wall simulation inside water. I am expecting to see pressure waves inside water. Good news is the simulation works fine and I can see the waves.
However, bad news is while I start to save pressure values at different points inside water using surface monitors, I get this weird number: -1.000000020040877e+20

This number appears on the console if I activate the console printing option and also appears on the surface monitor files. However, when I stop the simulation and look at the pressure contours, the pressure values are in normal expected range (around a few bars).

So I am confused now. How is that number generated and why? Any experience to how to solve it?

Again I should mention the simulation works fine. The residuals are good and there is no problem during simulation running. Just that pressure values sometimes (not always) are printed as this -1.000000020040877e+20 number instead of the actual number.

[ndabir]

any ideas?

[Far]

Originally Posted by ndabir

Hey all,

I am doing a moving wall simulation inside water. I am expecting to see pressure waves inside water. Good news is the simulation works fine and I can see the waves.
However, bad news is while I start to save pressure values at different points inside water using surface monitors, I get this weird number: -1.000000020040877e+20

This number appears on the console if I activate the console printing option and also appears on the surface monitor files. However, when I stop the simulation and look at the pressure contours, the pressure values are in normal expected range (around a few bars).

So I am confused now. How is that number generated and why? Any experience to how to solve it?

Again I should mention the simulation works fine. The residuals are good and there is no problem during simulation running. Just that pressure values sometimes (not always) are printed as this -1.000000020040877e+20 number instead of the actual number.

Flow is incompressible and you are applying moving wall with closed domain > This will always be problem.

[ndabir]

I am considering the flow to be compressible. And as I said there is no problem in the simulation results itself. The problem is coming from how fluent writes the numbers in the surface monitors. The actual numbers are OK when I check them in the contour plots but when I write them in surface monitors, it shows them as -1e+20.

[Far]

Originally Posted by ndabir

I am considering the flow to be compressible. And as I said there is no problem in the simulation results itself. The problem is coming from how fluent writes the numbers in the surface monitors. The actual numbers are OK when I check them in the contour plots but when I write them in surface monitors, it shows them as -1e+20.

Can you please share your screen shots of these results and how you are setting them in fluent?

[ndabir]

Please see the attached picture. This is the surface monitor of pressure at a point in water. As you can see sometimes the written pressure is the actual number (around -52000 Pa) and sometimes the written pressure is -1e+20.

[ndabir]

Does anybody know why fluent is writing numbers as -1e20?

[Far]

which monitor you are observing? how you had defined that one? any details of what you are setting up?