Drag and lift monitors in Fluent 18?

liebowitz · June 22, 2017, 22:28

Hi

I have recently shifted to version 18 of Fluent. The UI has received a slight update, and in the solver, the monitors for the drag and lift coefficients are no longer where they used to be (under the Solution Monitors).

Could anyone please let me know where to find the option to turn these on? Again, I am referring to the plots versus number of iterations (or other scales) that can be viewed alongside the residuals, while the solution is being calculated.

I have checked the updated Help section, and looked at online guides, but to no avail.

Many thanks,
Matt

Touré · June 23, 2017, 03:10

Hi,

On the menu:
Solving → Reports → Definitions → New → Force Report → Choose Drag, Lift or Moment.

On the tree:
Solution → Report Definitions → New → Force Report → Choose Drag, Lift or Moment.

Make sure that Coefficient is selected in "Report Output Type" instead of Force, and select the wall(s).
Check "Report Plot" for a plot of the coefficient (Drag, Lift or Moment) while the simulation is running. You can check also Report File if you want to save the results in a file for a post-process with another software for example.

T.

liebowitz · June 23, 2017, 11:08

Thank you so much, Touré!

Leonardo.flores · December 5, 2017, 12:17

Thank you, this was very helpful. Do you know how to Plot the Drag and Lift Report again, after its closed, in Fluent 18 or CFD Post?

The way I am plotting it is opening the .OUT file in Excel and separating the spaces in different columns, and then plotting X vs Y. But it takes some time and dont feel very comfortable with this method, since I have many results and want to compare them (for example using Workbench... )

Touré · December 6, 2017, 18:36

I don't see nowhere the plot button

to plot the Drag and Lift Report again, after its closed, in Fluent 18.

First method (might work but not always), if the Fluent project is not closed but only the plot windows are closed. Go to the Tree --> "run calculation" specify a "Number of iterations" = 0 and click on Calculate. The windows will pop up again.

Second method (will work for sure), if you have saved the report files. Go the tree: Results --> Plots --> File --> Click on "Add" (In the new window, you can select the files and make sure that "Files of type" is "All files (*)" otherwise you might not see some of the files because "Files of type" is "XY Files (*.xy)" by default)

Leonardo.flores · December 26, 2017, 12:37

Thank you Toure, the second method worked. I thought only .XY files were compatible, but it reads .OUT files too.

esha · May 20, 2019, 14:41

Hi, I have two questions
1. I also recently switched to new version 19 of fluent. but have peoblem in creating files for coefficient of drag and lift in batch mode (as the lower version was able to create a local file in linux working directory, ) because I did not find any option to give a path for linux. could anyone please let me know how may I solve this problem?
2. How may I read the case file of higher fluent version in lower fluent version? I have read in a post that we can save the case file as *.cas file or *.cas.gz file but it gives me error as the file with * cannot be saved.

June 22, 2017, 22:28	Drag and lift monitors in Fluent 18?	#1
liebowitz New Member Mathew Liebowitz Join Date: Jun 2017 Posts: 7 Rep Power: 8	Hi I have recently shifted to version 18 of Fluent. The UI has received a slight update, and in the solver, the monitors for the drag and lift coefficients are no longer where they used to be (under the Solution Monitors). Could anyone please let me know where to find the option to turn these on? Again, I am referring to the plots versus number of iterations (or other scales) that can be viewed alongside the residuals, while the solution is being calculated. I have checked the updated Help section, and looked at online guides, but to no avail. Many thanks, Matt saihasil and Leonardo.flores like this.

June 23, 2017, 03:10		#2
Touré Member Guiliguili Join Date: Aug 2010 Location: Montréal Posts: 97 Rep Power: 15	Hi, On the menu: Solving → Reports → Definitions → New → Force Report → Choose Drag, Lift or Moment. On the tree: Solution → Report Definitions → New → Force Report → Choose Drag, Lift or Moment. Make sure that Coefficient is selected in "Report Output Type" instead of Force, and select the wall(s). Check "Report Plot" for a plot of the coefficient (Drag, Lift or Moment) while the simulation is running. You can check also Report File if you want to save the results in a file for a post-process with another software for example. T. shashanktiwari619, liebowitz, Leonardo.flores and 1 others like this.

June 23, 2017, 11:08		#3
liebowitz New Member Mathew Liebowitz Join Date: Jun 2017 Posts: 7 Rep Power: 8	Thank you so much, Touré! Touré and Leonardo.flores like this.

December 6, 2017, 18:36		#5
Touré Member Guiliguili Join Date: Aug 2010 Location: Montréal Posts: 97 Rep Power: 15	I don't see nowhere the plot button to plot the Drag and Lift Report again, after its closed, in Fluent 18. First method (might work but not always), if the Fluent project is not closed but only the plot windows are closed. Go to the Tree --> "run calculation" specify a "Number of iterations" = 0 and click on Calculate. The windows will pop up again. Second method (will work for sure), if you have saved the report files. Go the tree: Results --> Plots --> File --> Click on "Add" (In the new window, you can select the files and make sure that "Files of type" is "All files ()" otherwise you might not see some of the files because "Files of type" is "XY Files (.xy)" by default) Leonardo.flores likes this.

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December 5, 2017, 12:17		#4
Leonardo.flores Member Leonardo Join Date: Nov 2017 Posts: 37 Rep Power: 8	Thank you, this was very helpful. Do you know how to Plot the Drag and Lift Report again, after its closed, in Fluent 18 or CFD Post? The way I am plotting it is opening the .OUT file in Excel and separating the spaces in different columns, and then plotting X vs Y. But it takes some time and dont feel very comfortable with this method, since I have many results and want to compare them (for example using Workbench... )

December 26, 2017, 12:37		#6
Leonardo.flores Member Leonardo Join Date: Nov 2017 Posts: 37 Rep Power: 8	Thank you Toure, the second method worked. I thought only .XY files were compatible, but it reads .OUT files too.

May 20, 2019, 14:41		#7
esha Member Join Date: Aug 2018 Posts: 85 Rep Power: 7	Hi, I have two questions 1. I also recently switched to new version 19 of fluent. but have peoblem in creating files for coefficient of drag and lift in batch mode (as the lower version was able to create a local file in linux working directory, ) because I did not find any option to give a path for linux. could anyone please let me know how may I solve this problem? 2. How may I read the case file of higher fluent version in lower fluent version? I have read in a post that we can save the case file as .cas file or .cas.gz file but it gives me error as the file with * cannot be saved.