solid fluid coupled interface problem to find out 'h' value?

Rajaero · August 24, 2017, 01:29

Hello guys..
i am doing fluid and solid coupled interface problem to find out the heat transfer coefficient. i have solved the case and got h value.
But,
There are two interface was created by fluent. so if want to calculate h value then which i need to choose?
for example,
Area-Weighted Average
Surface Heat Transfer Coef. (w/m2-k)
-------------------------------- --------------------
all-solid-contact_region-trg -14.667882
contact_region-src 41.948711
in this which interface value i should consider? or i need to calculate the net value?

is reverse flow becuse of following reasons?
1.mesh quality
2.outlet domain is too short.
3.chage pressure outlet to out flow condition (can i set outflow condition if ideal gas was used?)

Reverse flow will affect the solution or it only affect the convergence rate?

thanks in advance...

tong6061 · August 15, 2019, 09:05

have u got the answer? i get the same problem..?

in my case, i have

fluid_solid-src 3788.8446 fluid_solid-trg -3788.7229

and after calculation by hand, i get similar answer around 4000. so i assume in my case, i just need take one of them..

tks advanced.

MIDHUN@CFD · September 2, 2019, 00:12

check which is the fluid boundary .. this are two interfaces one at solid and other at fluid boundary. take readings at fluid boundary. you can check which one is fluid by opening results in cfd post . on top left you can see which wall comes under fluid domain.

August 24, 2017, 01:29	solid fluid coupled interface problem to find out 'h' value?	#1
Rajaero Member Taiwan,new north city Join Date: Aug 2017 Location: Taiwan Posts: 74 Rep Power: 8	Hello guys.. i am doing fluid and solid coupled interface problem to find out the heat transfer coefficient. i have solved the case and got h value. But, There are two interface was created by fluent. so if want to calculate h value then which i need to choose? for example, Area-Weighted Average Surface Heat Transfer Coef. (w/m2-k) -------------------------------- -------------------- all-solid-contact_region-trg -14.667882 contact_region-src 41.948711 in this which interface value i should consider? or i need to calculate the net value? is reverse flow becuse of following reasons? 1.mesh quality 2.outlet domain is too short. 3.chage pressure outlet to out flow condition (can i set outflow condition if ideal gas was used?) Reverse flow will affect the solution or it only affect the convergence rate? thanks in advance...

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August 15, 2019, 09:05		#2
tong6061 New Member zhou tong Join Date: Dec 2018 Posts: 2 Rep Power: 0	have u got the answer? i get the same problem..? in my case, i have fluid_solid-src 3788.8446 fluid_solid-trg -3788.7229 and after calculation by hand, i get similar answer around 4000. so i assume in my case, i just need take one of them.. tks advanced.

September 2, 2019, 00:12		#3
MIDHUN@CFD Member MIDHUN Join Date: Nov 2012 Location: calicut Posts: 45 Rep Power: 13	check which is the fluid boundary .. this are two interfaces one at solid and other at fluid boundary. take readings at fluid boundary. you can check which one is fluid by opening results in cfd post . on top left you can see which wall comes under fluid domain.