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Forum: CFX

June 21, 2012, 06:18

Replies: 10

questions about sensitivity analysis and adaptive timestep

Views: 3,381

Posted By ghorrocks

You have to decide what are the important...

You have to decide what are the important parameters for your simulation - generally these are the output variables you are doing the simulation for in the first place (drag, lift, pressure drop,...

Forum: CFX

June 20, 2012, 18:44

Replies: 10

questions about sensitivity analysis and adaptive timestep

Views: 3,381

Posted By ghorrocks

Getting all these parameters right for a...

Getting all these parameters right for a simulation is an iterative process.

Start off with your guess of a suitable mesh. Assuming you are using adaptive time stepping (so the time step size is...

Forum: CFX

June 19, 2012, 22:07

Replies: 10

questions about sensitivity analysis and adaptive timestep

Views: 3,381

Posted By ghorrocks

It can be either. You can use adaptive time...

It can be either. You can use adaptive time stepping to find a time step size quickly, or you can use it so you define the convergence criteria and it finds the time step size automatically. This...

Forum: CFX

June 19, 2012, 20:07

Replies: 10

questions about sensitivity analysis and adaptive timestep

Views: 3,381

Posted By ghorrocks

Danial's comments are correct. "something...

Danial's comments are correct.

"something interesting happens" means that the run has gone for long enough for the important physics to start up. Often the very first bit of a simulation is boring...

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