Tumble Direction from

kri321shna · July 14, 2016, 04:31

Hello,

I have a query on tumble direction taken in converge output file --> dynamic_region0.out

Please check the attached image, i feel this image direction as positive tumble, but i am getting from dynamic_region0.out as negative value for the same behaviour.

is converge treating this direction as negative tumble??

can anyone clarify on this.

Thanks in advance.

Krishna

MFGT · July 14, 2016, 07:32

Hi Krishna,

the TumbleX, TumbleY and Swirl motions correspond to your x,y,z coordinate system (right thumb rule). If y is pointing out of the image, the tumble is negative, if its pointing into the image, tumble is positive.

Is this your coordinate system what i draw into the image?

kri321shna · July 14, 2016, 08:21

Hi Tobias,

Thank you for your response.

my CS is same as image and the velocity vectors as in image but i am getting negative Y tumble.

as per right hand thumb rule, the image shows negative tumble. am i right?

Krishna

MFGT · July 14, 2016, 08:24

Then its correct that your TumbleY is negative.
To avoid this, you could rotate your complete geometry.

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July 14, 2016, 08:21		#3
kri321shna Member Krishna Join Date: Apr 2012 Posts: 54 Rep Power: 14	Hi Tobias, Thank you for your response. my CS is same as image and the velocity vectors as in image but i am getting negative Y tumble. as per right hand thumb rule, the image shows negative tumble. am i right? Krishna

July 14, 2016, 08:24		#4
MFGT Senior Member Tobias Join Date: May 2016 Location: Germany Posts: 295 Rep Power: 11	Then its correct that your TumbleY is negative. To avoid this, you could rotate your complete geometry.