FLUENT solves faster when moving mouse??

N0L3R · October 8, 2013, 08:36

Dear all, I noticed this today. I was doing a simulation of an infinitely long cylinder (2D) in crossflow from a tutorial.

What I noticed, is that, when moving the mouse in the FLUENT window, the solution time went down from 1:30:00 to about 00:05:00 and the solution did work out correctly as well as very short in time.

Can anyone explain this or even prove it? I know it sounds ridiculous but it's true and I've been flabbergasted with it.

I've even showed it to a friend of mine who has no explanation.

Thanks all

quantities · October 10, 2013, 02:14

It's a sensational discovery!

N0L3R · October 10, 2013, 03:47

So do you agree with me that this is true?

oj.bulmer · October 10, 2013, 06:06

Well there was a time when I used to think scrolling my download manager scrollbar accelerated the download

But probably all these are happy coincidences with different reasons? Is this phenomenon repetitive, for the same model and all other models you work on?

OJ

N0L3R · October 10, 2013, 06:19

Hi, yes I noticed it on other simulations such as an aerofoil. For the cylinder that I was testing, it definitely solved in shorter time and the result was also the same.

I was testing the tutorials found online from Cornell university

A CFD free user · October 10, 2013, 07:02

You are a genius man!

RodriguezFatz · October 10, 2013, 09:00

This is a well known bug, at least for the Ansys guys...
This can happen, when you start Fluent in workbench with multi-core. (At least in version 14.0). Just don't use workbench and you will be fine...

N0L3R · October 10, 2013, 10:47

Thanks a lot Philipp, that makes a lot of sense...

October 8, 2013, 08:36	FLUENT solves faster when moving mouse??	#1
N0L3R New Member Gary Galea Join Date: Oct 2013 Posts: 4 Rep Power: 12	Dear all, I noticed this today. I was doing a simulation of an infinitely long cylinder (2D) in crossflow from a tutorial. What I noticed, is that, when moving the mouse in the FLUENT window, the solution time went down from 1:30:00 to about 00:05:00 and the solution did work out correctly as well as very short in time. Can anyone explain this or even prove it? I know it sounds ridiculous but it's true and I've been flabbergasted with it. I've even showed it to a friend of mine who has no explanation. Thanks all

October 10, 2013, 07:02		#6
A CFD free user Senior Member A-A Azarafza Join Date: Jan 2013 Posts: 226 Rep Power: 14	You are a genius man! __________________ Regard yours

October 10, 2013, 09:00		#7
RodriguezFatz Senior Member Philipp Join Date: Jun 2011 Location: Germany Posts: 1,297 Rep Power: 26	This is a well known bug, at least for the Ansys guys... This can happen, when you start Fluent in workbench with multi-core. (At least in version 14.0). Just don't use workbench and you will be fine... ghost82 likes this. __________________ The skeleton ran out of shampoo in the shower.

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October 10, 2013, 02:14		#2
quantities New Member Join Date: Sep 2013 Location: Shanghai China Posts: 6 Rep Power: 12	It's a sensational discovery!

October 10, 2013, 03:47		#3
N0L3R New Member Gary Galea Join Date: Oct 2013 Posts: 4 Rep Power: 12	So do you agree with me that this is true?

October 10, 2013, 06:06		#4
oj.bulmer Senior Member OJ Join Date: Apr 2012 Location: United Kindom Posts: 473 Rep Power: 20	Well there was a time when I used to think scrolling my download manager scrollbar accelerated the download But probably all these are happy coincidences with different reasons? Is this phenomenon repetitive, for the same model and all other models you work on? OJ

October 10, 2013, 06:19		#5
N0L3R New Member Gary Galea Join Date: Oct 2013 Posts: 4 Rep Power: 12	Hi, yes I noticed it on other simulations such as an aerofoil. For the cylinder that I was testing, it definitely solved in shorter time and the result was also the same. I was testing the tutorials found online from Cornell university

October 10, 2013, 10:47		#8
N0L3R New Member Gary Galea Join Date: Oct 2013 Posts: 4 Rep Power: 12	Thanks a lot Philipp, that makes a lot of sense...