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Time-scaling coefficient

Posted Apr 29, 2010, 1:23 a.m. EDT 2 Replies

Rakesh Dhote
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Hi,

In the Heat transfer equation, the time scaling coefficient accounts for different time scale (mins/hrs instead of second).
I am using a dimensionless unit system. I am using time in milliseconds. Do I need to use time scaling coefficient as 1000 (1/0.001 sec) to accommodate for milliseconds in dimensionless system?
Please share your expertize.

Thanks in advance,
Rakesh
2 Replies Last Post Aug 20, 2010, 10:56 p.m. EDT
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago Apr 29, 2010, 2:13 a.m. EDT
Hi

for me dimensionless means normalisation (and that is all what the scale factor is about), but you should be able to take your/Comsols formulas and check the units such to identify the correct scale factor and units, no?

Have fun Comsoling
Ivar
Hi for me dimensionless means normalisation (and that is all what the scale factor is about), but you should be able to take your/Comsols formulas and check the units such to identify the correct scale factor and units, no? Have fun Comsoling Ivar
Wei Hong
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Posted: 1 decade ago Aug 20, 2010, 10:56 p.m. EDT
I am afraid dimensionless means much more than scaling! The denominator doesn't have to be constant.
A fomula is consistant in units automatically if written in a dimensionless form. Please don't treat your users like highschool kids.
I am afraid dimensionless means much more than scaling! The denominator doesn't have to be constant. A fomula is consistant in units automatically if written in a dimensionless form. Please don't treat your users like highschool kids.

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