I get an error when I enter 0 pressure ”Floating point exception”

Using SimScale Fluid Flow / CFD
1

I am trying to perform computational fluid dynamics on the compressible flow of a turbo compressor as shown below, but I get an error and cannot calculate.
Someone help

I get an error when I enter 0 pressure ”Floating point exception”

What is causing the error?

2

Hi tiida,

please have a look at this article about the issue.

I hope that helps. I also saw that you have a time depending table for your pressure outlet in a steady state simulation. What is the reason behind this?

Best regards Sebastian

3

Thank you for your reply.
I looked at the article I received and took measures, but the problem still persists.

The reason for using the pressure table is that the calculations did not converge.

4

Hi,
Can you try to change the pressure outlet boundary condition from a fixed value to a mean value.
With that the pressure at the outlet will be calculated accordingly to the flow situation.

Best regards Sebastian

1 Like
5

Hello SBlock!

Thanks to you, I was able to proceed with the analysis without the “Floating point exception”! !!

What was the cause?

6

One cause of floating point exception errors is a calculation that returns “Not a number”. One common occurrence is a division by zero (i.e. infinity).

By setting pressure to zero in a compressible simulation, you are getting exactly that: a division by zero in a calculation.

Are you sure that you need an absolute pressure of zero for a turbo compressor? :slight_smile:

7

I haven’t set the pressure to 0 as commented above.
However, an error occurred and the calculation stopped, so I posted it on the forum.