Locating max residuals in volume

gerald · February 26, 2022, 03:57

Hello,
Is there a way to monitor the location (x,y,z) where residual(s) are maximum, along iterations?
Best,
Gérald

bigfootedrockmidget · February 26, 2022, 15:56

With the keyword MAX_RES you can add the maximum value of the residuals for each of the transported variables to the history file. It will not give you the locations where these values occur, for that you'll have to check the volume fields in paraview.

gerald · February 27, 2022, 04:00

Thanks for the information and tip. I guess the keywords RES_DENSITY or RES_XXX should be added to the VOLUME_OUTPUT variables in the .cfg to get in the residuals in the field output file. Would I then get the explicit residual (in case I am running a steady RANS/euler simulation with an implicit stage)?
Best,
Gérald

TKatt · February 28, 2022, 12:33

Just use

Code:

VOLUME_OUTPUT= RESIDUAL, ...

to get the residuals of all solution variables. Then I would recommend using the Threshold filter in Paraview to identify spots with high residuals (in case that does not become obvious at first glance of the results).

I am not sure what you mean with 'explicit residual' though. For a steady simulation the residual is computed the same way for explicit or implicit simulation (as far as I am aware of)

gerald · March 2, 2022, 02:14

Many thanks for your answer. I am not a numerician, but as far as I know some codes distinguish between the "explicit" residual , physically relevant if I understand it right, and an "implicit" residual used somehow in the implicit scheme. If there is no such distinction in SU2 then it's fine I guess.
Best,
Gérald

February 26, 2022, 03:57	Locating max residuals in volume	#1
gerald New Member Join Date: Apr 2021 Posts: 6 Rep Power: 5	Hello, Is there a way to monitor the location (x,y,z) where residual(s) are maximum, along iterations? Best, Gérald Last edited by gerald; February 26, 2022 at 03:59. Reason: Add tags

February 28, 2022, 12:33		#4
TKatt Member na Join Date: Jul 2018 Posts: 83 Rep Power: 7	Just use Code: VOLUME_OUTPUT= RESIDUAL, ... to get the residuals of all solution variables. Then I would recommend using the Threshold filter in Paraview to identify spots with high residuals (in case that does not become obvious at first glance of the results). I am not sure what you mean with 'explicit residual' though. For a steady simulation the residual is computed the same way for explicit or implicit simulation (as far as I am aware of)

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February 26, 2022, 15:56		#2
bigfootedrockmidget Senior Member bigfoot Join Date: Dec 2011 Location: Netherlands Posts: 506 Rep Power: 17	With the keyword MAX_RES you can add the maximum value of the residuals for each of the transported variables to the history file. It will not give you the locations where these values occur, for that you'll have to check the volume fields in paraview.

February 27, 2022, 04:00		#3
gerald New Member Join Date: Apr 2021 Posts: 6 Rep Power: 5	Thanks for the information and tip. I guess the keywords RES_DENSITY or RES_XXX should be added to the VOLUME_OUTPUT variables in the .cfg to get in the residuals in the field output file. Would I then get the explicit residual (in case I am running a steady RANS/euler simulation with an implicit stage)? Best, Gérald

March 2, 2022, 02:14		#5
gerald New Member Join Date: Apr 2021 Posts: 6 Rep Power: 5	Many thanks for your answer. I am not a numerician, but as far as I know some codes distinguish between the "explicit" residual , physically relevant if I understand it right, and an "implicit" residual used somehow in the implicit scheme. If there is no such distinction in SU2 then it's fine I guess. Best, Gérald