ROOT-MEAN-SQUARE
 

Hi there, does anyone know how to create the root-mean-square (RMS) of a scalar quantity such as the fluctuating velocity U? Does STAR have a command or some other means of doing this?

Kind regards

Andy

Re: ROOT-MEAN-SQUARE
 

You should be able to get pretty much what you need although it typically takes a few commands so I would type them into an editor then cut and paste or create a panel/inp file.

Using

Integrate Operate commands *get

you should be able to get there

Load the scalar and use operate to square it

oper x**2 4 4

Get the correct section/ cell set

Intergrate or summarize the values

use *get to the appropriate values to form a mean

Integrate can give you an area weighted average

Summarize can give you an volume weighted value (you will need to user operate getc volume into another register first) or a simple numerical average

use *set to divide the two numbers

then use *calc to do the square root