Learning Forum

[m.kusbeci]

Hi,

 

My problem is about extracting probe data from a moving mesh zone. The geometry I have is of a gas turbine pre-swirl cavity where there is relative motion of receiver holes on rotor and the pre-swirl holes on the stator. The computational domain consists of stationary and rotating zones. I have defined mesh motion on the rotating frame  (rotational).

In Fluent, is it possible to add a probe in the rotating frame so that the probe travels with the rotating disc? I have tried this without any success in the past; the probes (points) I place seem to stay in the stationary frame. Maybe if there is a way to assign the probe to a specific node location, this could be possible.

My temporary workaround this problem involves exporting the solution data in each time step in tecplot format, and then read it using paraview. I have written a bash script which updates the probe location for each tecplot file and passes it to the pvpython script, which gives a .CSV file as an output. I then use another python script to combine all the .CSV files from all time-steps into one big .CSV file which contains all the time-steps.

A simpler approach will be greatly appreciated.

Kind Regards,

Maz

[teoman]

Hi Maz

Have you found any solution to the your problem that I have the same.

Regards

Teoman

[Rob]

Not at present. The usual trick is to split a cell or facet out of the mesh and monitor that. It's on the "to do" list but not as simple a task as it sounds.

[teoman]

Dear Rob

If we can describe Probe wit a Node ID. It may be the solution. Because we can move the Node with CG_Motion or Grid_Motion.And Define Report for Point surfaces.

I need to track certain nodes on a blade section to verfy the simulation .Because my study is based on a actual experiment results.

If you can give more info about the trick is to split a cell or facet out of the mesh and monitor that. It would be priceless help for me.

Many thanks and Regards.

Teoman

[teoman]

Hi

My solution is :

I defined mini surface areas to represent sensors on a blade section. These areas had different Named Sections and face meshing.

Assigned the same UDF , which assigned to the blade , to the sensor areas. .So that ,It became possible to define Report on the sensor areas

with Area Average/ Static Pressiure option.

Finally I obtained moving and result reporting surface areas for each Time Step.

Kind Regards.