Menu

Discussion Forum

New Discussion
Filtern

Note: This discussion is about an older version of the COMSOL Multiphysics® software. The information provided may be out of date.

Discussion Closed This discussion was created more than 6 months ago and has been closed. To start a new discussion with a link back to this one, click here.

Volume Integration and Surface Integration

Posted 27.02.2013, 00:51 GMT-5 Fluid & Heat, Heat Transfer & Phase Change, Computational Fluid Dynamics (CFD), Modeling Tools & Definitions, Parameters, Variables, & Functions, Results & Visualization, Studies & Solvers Version 4.3a 1 Reply

Nithin
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

What is the use of volume integration and surface integration for the parameters like temperature, pressure and velocity??
1 Reply Last Post 27.02.2013, 01:40 GMT-5
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Posted: 1 decade ago 27.02.2013, 01:40 GMT-5
Hi

I'm not sure I understand you fully, indeed the integration of a temperature Field T(x,y,z,t) over a domain ends up with units K*m^3, as such not a usual physical global variable, but if you rather integrate over the volume rho*Cp*(T-T0) you get the increase in internal energy which is rather a usual and interesting variable

and to get the average temperature you need to integrate T over the volume and divide by the integration aver the volume of "1" i.e. the total volume. But now in V4 we have this in the average operator (if we consider the full domain)

This applies by similarity to p and v and many other variables

--
Good luck
Ivar
Hi I'm not sure I understand you fully, indeed the integration of a temperature Field T(x,y,z,t) over a domain ends up with units K*m^3, as such not a usual physical global variable, but if you rather integrate over the volume rho*Cp*(T-T0) you get the increase in internal energy which is rather a usual and interesting variable and to get the average temperature you need to integrate T over the volume and divide by the integration aver the volume of "1" i.e. the total volume. But now in V4 we have this in the average operator (if we consider the full domain) This applies by similarity to p and v and many other variables -- Good luck Ivar

Note that while COMSOL employees may participate in the discussion forum, COMSOL® software users who are on-subscription should submit their questions via the Support Center for a more comprehensive response from the Technical Support team.

Suggested Content