[lara.croft.]

Hi
I'm beginner in FLUENT. I'm trying to solve natural convection problem in water heater. All of wall side are insulated. The tube is structured vertical. Temperature tube stage 1 = 360K, Temperature tube stage 2 = 330K and Temperature stage 3 = 320K. Water in water heater is transient. Which kind approach to solve my problem. I did it with density based and bousinessq.

Properties (water)
rho=988.06
Cp=4181.5
mu=0.0054788
k=0.0271
Beta=0.000457
gravity= -9.81

Any other helpful suggestion?
thanks

[diamondx]

did you run your case. Can we take a look at your results ?

[lara.croft.]

Originally Posted by diamondx

did you run your case. Can we take a look at your results ?

Thanks ali for your response
Yes I did it.
this is my meshing form
meshing.jpg

First, I tried without bousinessq approximation
I just input the gravity (y=9.81) and without initialize (no compute from)
contour temp.jpgcontour velocity.jpg

but 2 days ago i asked my friend. I should do "compute from" with all-zones and the result was error. I also tried with bousinessq approximation (all properties) and the result same with the previous result (error)
The last one, why my reference value is still air properties? although i changed into water material

Please tell me any suggestion for this case ali
Thanks