# Generating Cd vs. Mach # Report in Fluent

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 December 16, 2018, 16:34 Generating Cd vs. Mach # Report in Fluent #1 New Member   Nabeel Sherazi Join Date: Dec 2018 Location: Boston, MA Posts: 2 Rep Power: 0 Hi guys, First post here so sorry if I commit any etiquette faux-pas. I'm a student trying to learn Fluent and struggling with the graph I want to generate. So far, I have learned how to get my airfoil geometry into Fluent and generate a mesh. The pressure and velocity diagrams all look good, but I'm struggling with how to use the reports feature to make a coefficient of drag vs. Mach number XY plot. In Fluent, I made my far-field boundary condition velocity a parameter, so that I could hopefully iterate through it to make the graph. I also set a report definition that outputs the coefficient of drag when I click calculate. However, the only way I have found so far to calculate it quickly for many values is to change the parameter by hand in Workbench and click "Update Design Points," which then lists the new . I have been moving them by hand into Excel. I'm certain there's a better way to do this, and would be very grateful if someone had some advice on how to approach this problem. I have read the Fluent documentation several times, but it doesn't cover making reports in this way at all. Thank you so much for reading.

December 17, 2018, 07:49
#2
Senior Member

Lucky
Join Date: Apr 2011
Location: Orlando, FL USA
Posts: 5,665
Rep Power: 65
Fluent won't generate the drag coefficient vs Mach number plot. What you have is working as intended.

Quote:
 Originally Posted by nabeelsherazi I also set a report definition that outputs the coefficient of drag when I click calculate. However, the only way I have found so far to calculate it quickly for many values is to change the parameter by hand in Workbench and click "Update Design Points," which then lists the new . I have been moving them by hand into Excel.

You are probably 90% of the way there. You can make this report/monitor otuput to a text file (how to do this differs slightly between versions) and then smartly read them into excel using some VBA coding for many cases. The last thing to do is set up a script to smartly run all the cases in Fluent without manually clicking the run button in workbench. To automate all this requires quite a bit of learning. It may or may not be faster to keep doing it manually.

 December 17, 2018, 21:30 #3 New Member   Nabeel Sherazi Join Date: Dec 2018 Location: Boston, MA Posts: 2 Rep Power: 0 Ahhh... a bummer, but good to know that I was on the right track. Now my efforts feels less misguided Thanks so much LuckyTran for your help! I appreciate it very much

 Tags fluent, mach number, parameter set, reports