how can I obtaion the aerodynamic forces on any component (boundary) from the restar

qooin · May 24, 2024, 08:53

After completing the CFD computation, how can I retrieve the aerodynamic forces on any component (boundary) from the restart file? This question arises because the boundaries for the integrated forces in the history file are specified in MARKER_MONITORING, but I need to analyze the forces on other components.

bigfootedrockmidget · May 24, 2024, 16:39

Why don't you include all markers in MARKER_MONITORING? You get the aerodynamic coefficients of all individual markers.

You can also save your problem as a multiblock paraview file. Then you have the individual markers available and you can use paraview's surface integration.

qooin · May 24, 2024, 19:47

If I put all the markers into MARKER_MONITORING, I will only get the total aerodynamic force from the history, not the integrated force for each marker.
My goal is to obtain the aerodynamic forces for all markers from a single CFD calculation.

bigfootedrockmidget · May 25, 2024, 08:16

Code:

MARKER_MONITORING= surface1, surface2

% Sum of the integrals over surface1 and surface2: CL, CD

HISTORY_OUTPUT= AERO_COEFF

Code:

MARKER_MONITORING= surface1, surface2

% Individual integrals over surface1 and surface2: CL(surface1), CL(surface2)

HISTORY_OUTPUT= AERO_COEFF_SURF

qooin · May 25, 2024, 09:56

Thank you very much; this has solved a long-standing issue for me because I did not see AERO_COEFF_SURF in temp.cfg.

Additionally, I have another related question. May I ask it here in this thread? The question is: If MARKER_MONITORING = surface1, surface2 is given and the results need to be output to the Tecplot file (i.e., OUTPUT_FILES = (SURFACE_TECPLOT_ASCII)), I desire the Tecplot file to generate two zones. However, no matter how many surfaces are in MARKER_MONITORING, they all end up as a single zone in the Tecplot file.

bigfootedrockmidget · May 30, 2024, 15:41

I do not use tecplot, so I do not know if we the write proper multizone information to tecplot.

May 24, 2024, 08:53	how can I obtaion the aerodynamic forces on any component (boundary) from the restar	#1
qooin New Member zhou Join Date: Mar 2019 Posts: 7 Rep Power: 7	After completing the CFD computation, how can I retrieve the aerodynamic forces on any component (boundary) from the restart file? This question arises because the boundaries for the integrated forces in the history file are specified in MARKER_MONITORING, but I need to analyze the forces on other components.

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May 24, 2024, 16:39		#2
bigfootedrockmidget Senior Member bigfoot Join Date: Dec 2011 Location: Netherlands Posts: 545 Rep Power: 17	Why don't you include all markers in MARKER_MONITORING? You get the aerodynamic coefficients of all individual markers. You can also save your problem as a multiblock paraview file. Then you have the individual markers available and you can use paraview's surface integration.

May 24, 2024, 19:47		#3
qooin New Member zhou Join Date: Mar 2019 Posts: 7 Rep Power: 7	If I put all the markers into MARKER_MONITORING, I will only get the total aerodynamic force from the history, not the integrated force for each marker. My goal is to obtain the aerodynamic forces for all markers from a single CFD calculation.

May 25, 2024, 09:56		#5
qooin New Member zhou Join Date: Mar 2019 Posts: 7 Rep Power: 7	Thank you very much; this has solved a long-standing issue for me because I did not see AERO_COEFF_SURF in temp.cfg. Additionally, I have another related question. May I ask it here in this thread? The question is: If MARKER_MONITORING = surface1, surface2 is given and the results need to be output to the Tecplot file (i.e., OUTPUT_FILES = (SURFACE_TECPLOT_ASCII)), I desire the Tecplot file to generate two zones. However, no matter how many surfaces are in MARKER_MONITORING, they all end up as a single zone in the Tecplot file.

May 30, 2024, 15:41		#6
bigfootedrockmidget Senior Member bigfoot Join Date: Dec 2011 Location: Netherlands Posts: 545 Rep Power: 17	I do not use tecplot, so I do not know if we the write proper multizone information to tecplot.