How to track domain-wide kinetic energy for spin-up check in FDS?

[HEROISCOMING1]

Hello,

I would like to check whether the spin-up period has been reached in my FDS simulation by monitoring the temporal evolution of the domain-integrated kinetic energy.

Is there a way to obtain the kinetic energy over the entire computational domain using a &DEVC command?

If this is not possible directly with &DEVC, what is the recommended way in FDS to track the domain-wide kinetic energy to determine when spin-up is achieved?

Thank you for your help.

[drjfloyd]

User's Guide Chapter 22 Output

[HEROISCOMING1]

I found the "measure of turbulence resolution" section in the User Guide (22.10.28), and I would like to confirm whether I understood it correctly.

First, I obtain the subgrid kinetic energy using:

&DEVC ..., QUANTITY='SUBGRID KINETIC ENERGY' /

Then, I calculate the resolved turbulent kinetic energy (TKE) from the velocity components:

&DEVC ..., QUANTITY='U-VELOCITY' /
&DEVC ..., QUANTITY='V-VELOCITY' /
&DEVC ..., QUANTITY='W-VELOCITY' /

After that, I compute the M value using Eq. (22.54) in the User Guide, and my understanding is that the simulation is considered to have adequate turbulence resolution when M is maintained around 0.2.

Is this interpretation correct?

[rmcdermo]

yes

[HEROISCOMING1]

Thank you~!