number of digits

Thomashoffmann · January 29, 2013, 09:07

hey all.
I'm plotting some temperature profiles in CFD post, see attached. Ass seen the plot is very notchy because Fluent only calculates with 3 digits after the comma.
Does any of you guys know how to configure fluent to calculate with more than 3 digits after the comma?

Thanks

Thomas

vasava · January 30, 2013, 07:42

If you are making XY-Plot, look in Plot>XY Plot > Axes > Precision.

Thomashoffmann · January 30, 2013, 08:28

Hi.
Is that in CFD-Post? I can't find the buttons you mention..
I've created a Chart where the data source comes from a Line that I've created in the section where I want to see the temperature profile.

vasava · January 30, 2013, 08:55

Soory my mistake, I put options for Fluent.

For CFD-Post look in to Chart > X-axis(tab). Uncheck 'Determine the number format automatically' and then you will be able to edit 'Precision'.

Thomashoffmann · January 30, 2013, 09:00

hmm, I've tried that, see attached.. I think Fluent have only calculated the result with 3 digits. When I increase the precision to 7, it just gives me zeros after the third digit...
Do you know how to configure Fluent to be more precise in the calculation?

Thanks

oj.bulmer · January 30, 2013, 10:42

Maybe, running in double precision may help?

Thomashoffmann · January 30, 2013, 10:46

it actually is with double precision...

vasava · January 31, 2013, 05:56

Then I think this 'stair step' behaviour is due to the mesh in y-direction. Did you use boundary layer?

January 30, 2013, 07:42		#2
vasava Senior Member Paritosh Vasava Join Date: Oct 2012 Location: Lappeenranta, Finland Posts: 732 Rep Power: 22	If you are making XY-Plot, look in Plot>XY Plot > Axes > Precision. mrenergy likes this.

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January 30, 2013, 08:28		#3
Thomashoffmann Member Thomas Hoffmann Join Date: Oct 2012 Posts: 67 Rep Power: 13	Hi. Is that in CFD-Post? I can't find the buttons you mention.. I've created a Chart where the data source comes from a Line that I've created in the section where I want to see the temperature profile.

January 30, 2013, 08:55		#4
vasava Senior Member Paritosh Vasava Join Date: Oct 2012 Location: Lappeenranta, Finland Posts: 732 Rep Power: 22	Soory my mistake, I put options for Fluent. For CFD-Post look in to Chart > X-axis(tab). Uncheck 'Determine the number format automatically' and then you will be able to edit 'Precision'.

January 30, 2013, 10:42		#6
oj.bulmer Senior Member OJ Join Date: Apr 2012 Location: United Kindom Posts: 473 Rep Power: 20	Maybe, running in double precision may help?

January 30, 2013, 10:46		#7
Thomashoffmann Member Thomas Hoffmann Join Date: Oct 2012 Posts: 67 Rep Power: 13	it actually is with double precision...

January 31, 2013, 05:56		#8
vasava Senior Member Paritosh Vasava Join Date: Oct 2012 Location: Lappeenranta, Finland Posts: 732 Rep Power: 22	Then I think this 'stair step' behaviour is due to the mesh in y-direction. Did you use boundary layer?