drag_coefficient

calim_cfd · June 2, 2012, 09:17

Hello ccm users!!! Greetings!

edited:

i have a different question regarding the drag assessment of a car - underhood: by using a no-slip wall with speed equal to the mainstream velocity beneath the wake, make too much difference in the drag estimate? i usually set the whole floor to no-slip v=0m/s.

Also, by using a MRF, instead of the momentum source to model the pressure variation across the fan patch, do we have a significantly difference in the results? whats the best approach MRF or fan modeling, say for a top speed condition?? if using a MRF what should be the rpm?

sry for the big post...

any comments are most welcome!

ty for your time

calim_cfd · June 5, 2012, 23:35

i edited the question cuz i got the answer to those ones.. thx..

now i need a hand with those two new ones

tyty

June 2, 2012, 09:17	drag_coefficient	#1
calim_cfd Senior Member mauricio Join Date: Jun 2011 Posts: 172 Rep Power: 18	Hello ccm users!!! Greetings! edited: i have a different question regarding the drag assessment of a car - underhood: by using a no-slip wall with speed equal to the mainstream velocity beneath the wake, make too much difference in the drag estimate? i usually set the whole floor to no-slip v=0m/s. Also, by using a MRF, instead of the momentum source to model the pressure variation across the fan patch, do we have a significantly difference in the results? whats the best approach MRF or fan modeling, say for a top speed condition?? if using a MRF what should be the rpm? sry for the big post... any comments are most welcome! ty for your time __________________ Best Regards /calim "Elune will grant us the strength" Last edited by calim_cfd; June 5, 2012 at 23:35.

June 5, 2012, 23:35		#2
calim_cfd Senior Member mauricio Join Date: Jun 2011 Posts: 172 Rep Power: 18	i edited the question cuz i got the answer to those ones.. thx.. now i need a hand with those two new ones tyty __________________ Best Regards /calim "Elune will grant us the strength"