# torque calculation

 Register Blogs Members List Search Today's Posts Mark Forums Read

 October 9, 2005, 06:32 torque calculation #1 sudhakar Guest   Posts: n/a hello everyone, the calculator in the CFX post is not able to calculate the torque for a specific result file. how to calculate torque using expressions in cfx post. can anyone help me... thank you

 October 9, 2005, 19:00 Re: torque calculation #2 Robin Guest   Posts: n/a What exactly are you trying to calculate torque on? -Robin

 October 10, 2005, 01:51 Re: torque calculation #3 sudhakar Guest   Posts: n/a am trying to calculate torque on a blade rotating abt x-axis. by the way what happened to forum at waterloo.ansys site.

 October 11, 2005, 12:23 Re: torque calculation #4 Robin Guest   Posts: n/a The CFX Forum was down for a few days due to server problems. It is back up now. More specific to my question, are you trying to calculate torque on a surface or volume? The torque calculation will not work on a volume. Regards, Robin

 October 11, 2005, 14:44 Re: torque calculation #5 sudhakar Guest   Posts: n/a i need the torque to be calculated for surfaces only. actually some functions(mass flow, massflow ave,torque) are not working for this specific result file. full(all) variables are written to the result file. may be some bug since the file is large. so i need to know how the torque can be calculated (in my case for the surfaces rotating about x-axis- to be particular). regards sudhakar

 October 12, 2005, 09:58 Re: torque calculation #6 Robin Guest   Posts: n/a Hi Sudhakar, It's possible the resutls file is incomplete. You could define an expression to integrate the torque instead by calculating the local Z and Y components of force times the radius. ty local = Pressure * Area Z * Y tz local = Pressure * Area Y * Z Torque on Blade = int(tz local + ty local)@blade Regards, Robin

 October 13, 2005, 10:02 Re: torque calculation #7 sudhakar Guest   Posts: n/a thanks Robin. But am not able to use that integral function in CEL. It gives some syntax error. so what is the syntax to use integral function -regards sudhakar

 October 13, 2005, 16:00 Re: torque calculation #8 Robin Guest   Posts: n/a Sorry, that should have been sum() not int(). -Robin

 October 14, 2005, 07:36 Re: torque calculation #9 sudhakar Guest   Posts: n/a Thank you Robin. I checked the expression for a result file(centrifugal pump) where i was able to calculate the torque using the calculator. but the value (for one blade surface) that i get using the expression is double than that i get from the functional calculator. is there anything wrong in the torque expression procedure i follow...my case is a centrifugal pump rotating abt x axis tylocal = Pressure * AreaZ * Y AreaZ = Area * Normal Y Similarly tzlocal = Pressure * AreaY * Z AreaY = Area * Normal Z Torque on blade = sum(tylocal+tzlocal)@bladesurface

 October 14, 2005, 08:33 Re: torque calculation #10 Robin Guest   Posts: n/a Area Z = Area * Normal Z Area Y = Area * Normal Y

 October 15, 2005, 10:17 Re: torque calculation #11 sudhakar Guest   Posts: n/a then too the value is about twice of the value got from the functional calculator.

 October 17, 2005, 09:35 Re: torque calculation #12 Robin Guest   Posts: n/a Hi Sudhankar, I just checked on one of my results files and the answers nearly match (there will be a slight difference, since the torque calculation uses the integration point values). My expressions are: EXPRESSIONS: Area Z = Area * Normal Z Area Y = Area * Normal Y ty local = Pressure * Area Z * Y tz local = Pressure * Area Y * Z Torque on Blade =sum(tz local + ty local)@BLADE END If you still see a difference, make sure your expressions are correct for your axis of rotation and that your regions are the same. Regards, Robin

 November 11, 2005, 07:04 Re: torque calculation #13 ravinandan Guest   Posts: n/a dear sir please the details regarding the torque calculations for Dc motor and all other related issues thanking you ravinandan

 December 9, 2005, 02:34 torque calculation #14 prashant ranjan maurya Guest   Posts: n/a dear sir please send the details regarding the torque calculations for Dc motor and all other related issues thanking you.

 December 19, 2005, 06:38 Re: torque calculation #15 C S KALLIGUDDA Guest   Posts: n/a How to calculate the torque for all applications. methods

 January 5, 2006, 10:08 Re: torque calculation #16 T.SELVAMUTHUKUMAR Guest   Posts: n/a we are the manufacturer of orbital shaker.we had problem to select a ac motor for our application.our requirement listed below. speed reduction ratio:1:4.how to select a motor whether based on torque or rpm requirement?

 Thread Tools Display Modes Linear Mode

 Posting Rules You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is OffTrackbacks are On Pingbacks are On Refbacks are On Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post Anonymized_JL1 FLUENT 14 September 26, 2013 03:35 bhanu1810 STAR-CCM+ 2 October 2, 2011 03:10 mach000 CFX 2 April 14, 2010 04:00 Kirill Main CFD Forum 0 June 26, 2007 16:59 AB CD-adapco 6 November 15, 2004 05:41

All times are GMT -4. The time now is 02:10.