[esp-r] CFD - bouyancy modelling has no effect?

[Andrew Cowie]

Hi all,

I've been running some simulations with the CFD in ESP-r, and I've noticed something that I consider a little odd.  Simulations run with bouyancy modelling (full ideal gas law calcs) and local heat sources in the CFD domain (ie. casual gains assigned to source-type cells) give results which are identical to simulations run without these elements (ie. no bouyancy modelling at all and complete removal of the source-type cells).  When I say identical, I mean that in every sense of the word; the unix command "diff" gives no output when comparing the CFD results output as ParaView files.

I am curious as to why this may be; I would expect to see at least minor numerical differences in the CFD results with these features.  Are these features automatically encapsulated within the adaptive conflation algorithms, overriding the CFD parameter file?  Are they no longer supported?  Do we know for a fact that these input parameters actually have any affect on the CFD calculations?  If anyone can shed any light on this I'd be greatly appreciative.

Cheers,
Andy Cowie