[marcel_jay]

Hello CFD Online Community,

I have an issue with changing the unit of an expression in CFD Post.

area()@Outlet

would get me

0.000199688 [m^2]

I want the result to be in mm^2 though. Multiplying by 1000^2 works, but it's still in m^2.

area()@Auslass * (1000^2) * 1[mm/m]

Something like this even changes the result.

Would be glad if somebody ever solved that issue.

Marcel

[evcelica]

Why not just change your unit system to custom in the options? Then change length and area to the units you want.

[marcel_jay]

Thanks for the advice, but it won't work for Custom.
If I set Newton Millimeter as the system, it would display them in mm, but not for custom. What do i do wrong?

[TrII4d]

Try to change the "Solution Units" under "Solver" in CFX-Pre and run CFX-solve again

[singer1812]

Keep it unitless. What are you using this for? Just output to something else? If so just call the expression something like this so you know what it is:

area Auslass mm = area()@Auslass * (1000^2) *1[m^-2]

[marshallmccray]

Adding to @singer1812 's response. If you just want custom units on the frame, a workaround would be to divide the variable by its own units to make it dimensionless, then manually add a text string of units next to the Auto Annotation. For example, to convert seconds to minutes, create new expression timeminutes = t/(60 [s]) then put text string "minutes" next to the auto annotation. See screenshot.