How to output the velocity field in compressible flow

[Zcaic]

Hello, I want to plot streamline in ParaView ,but I found no Velocity variable ，Can I output the velocity field or how plot streamline without Velocity in ParaView?

thanks!

[koodlyakshay]

You can ask for the primitive variables like velocity to be written in the paraview file by adding the keyword PRIMITIVE to the VOLUME_OUTPUT option in your config file. See here for more details.

[Zcaic]

OK，thanks，i will try to calculate it by myself in ParaView，I know Tecplot has this function.

[koodlyakshay]

In Paraview you can use the 'Calculator' filter to find velocity as Momentum/Density.

[Zcaic]

Thanks

[songjuzheng]

what's the unit of the velocity (Momentum/Density)? it's mach or m/s?

[pcarruscag]

For dimensional simulations it's m/s