[bioexplore]

Dear Foamers,

Recently I am trying to understand how the momentum equations in Rotating Frame is developed, and I found the wiki page at:
http://www.openfoamwiki.net/index.ph...RF_development
which show the development for the eqns in MRF.

But I didnot understand some items in these eqns (cause pics can not be paste on this page, the questions in attached as doc format), can anyone help me to explain it? It will be appreciated!

These items include "nabla dot [omega crossmultiply r]" equal to zero?

[bioexplore]

Anybody know this?

[viraj20feb]

Same doubt!


In the MRF equations development, do you know why
1) del dot (omega cross r) = 0?
2) gradient of (omega cross r) = 0?
3) u_R dot gradient of (omega cross r) = omega cross u_R?

I tried all the vector-tensor identities and relations but I am unable to get the answer.

Thanks a lot!

Viraj

Originally Posted by bioexplore

Dear Foamers,

Recently I am trying to understand how the momentum equations in Rotating Frame is developed, and I found the wiki page at:
http://www.openfoamwiki.net/index.ph...RF_development
which show the development for the eqns in MRF.

But I didnot understand some items in these eqns (cause pics can not be paste on this page, the questions in attached as doc format), can anyone help me to explain it? It will be appreciated!

These items include "nabla dot [omega crossmultiply r]" equal to zero?