Learning Forum

[Alex Chiella]

Hi! I noticed something strange in my Reynolds output parameter, with the order of magnitude being way off.
If I compute it at the end of the simulation, I get 200% instead of 20'000. The fact it displays the result as a percentage is weird in its own right, since I did not specify that in the expression.

I then tried to individually compute the density and molecular viscosity and everything is alright (I get 10^-2 and 10^-8 values, respectively).
But if I try to compute the ratio, this is what happens:

I get 1 with unit of measure [kg/n*m*s] and I have no idea what that n stands for.
It almost seems to me that is confuses the memory location for the real number values of viscosity and density, but again, there's that n among the units of measure to keep in consideration. I will again stress that when including velocity and diameter in the complete Reynolds formula, with their right units of measure, I get a wrong, percentage value.

There might be some major mistake/oversight on my part, but still, anyone has an idea of what's going on?

P.S. I also tried remaking all those variables from scratch, with different names, in case that could fix possible memory allocation issues, but nothing changed.

[Rob]

n should be N, ie Newtons. That's Fluent being case sensitive. 

I checked this yesterday in 2024R1, but looks like the system ate both posts. 

Double check what you're calculating, but also update to the current version. R19 would have been about the first release of Expressions and you may have found a problem. 

[Rob]

Hmm, and it's back...  https://innovationspace.ansys.com/forum/forums/topic/fluent-bug-in-storing-the-report-definition-variable/