Learning Forum

[hancar_27]

I am simulating a centrifugal pump using a transient approach in which a sliding mesh (mesh motion) is set for the rotating impeller caivity with respect to a static volute flowpath. This is all using FLUENT.

I am trying to predict my pressure rise calculated at the discharge for a given pressure inlet (5 psig) and flow condition (1 gpm). I am able to succesfully run my simulations, and I model 1 complete rotation of the rotating impeller cavity over 240 time steps, with a max of 20 iterations per time step.

The problem I have is; I want to view exclusively the data point at the end of each time step, which per time step should be 20 or less depending on if the convergence criteria is met. This would give me a total of 240 points to plot. Is there a way to filter the residuals plot and convergence plots in Fluent, and only display the last point of each time step?

Thanks in advance

[ai0013]

If you are using Linux, you can re direct the console's output to a log file and then use grep to extract the residuals at the very last iteration of your time step.

[Rob]

Thanks or if you use a monitor for flow (or anything else) that will be the value at the end of the time step. The residuals aren't attached to any reports at present but a request is in as being able to plot these may be useful for some of the remote running tasks.

[hancar_27]

Thanks for the feedback.
Maybe I'm misunderstanding, but what I see with my monitors is the value for all iterations (20 individual points per time step). I want to display only the value of the last iteration within each time step (The 20th point of each timestep, see attached). Is there a way to filter the plots within FLUENT to only display the last iteration of each time step? (points in red).

Thanks in advance

[Rob]

Check you've got the report set so the "get data" is set as time step. If you're showing residuals, then it's better to leave it reporting all values so you can see the progress within a time step.

[hancar_27]

Thanks so much! This clarified and helped a lot!