[rsaurabh]

Hi all,
i am doing a 2-D simulation where i wish to get flow rate in litre/minute but in fluent i have no such option. for now i am use following conversion-

litre/minute=10^(-3)m^3/60s
(m^3/s)*density(Kg/m^3)=Kg/s

i just want to know, is this way of doing it correct or not?
thanks in advance.

regards
saurabh

[CFD-fellow]

Hi
Go to define-> units->volume flow rate
make a new unit by putting its factor in regard to m3/s.

[rsaurabh]

Hi,
Thanks for your kind reply. i hope this will help.

[rsaurabh]

Hi,
i have checked my results but still i can not see flow rate in m^3/s in solution reports. where can i check volume flow rate in reports instead of mass flow rate?

[oozcan]

reports>volume integrals>

[rsaurabh]

It is giving me only m^3. so should i consider it as m^3/s

[oozcan]

reports>surface integrals>report type> volum flow rate,

or mass flow rate / density = it gives you ''volume flow rate''

[rsaurabh]

Thanks, i get it.
but i have to define zero static pressure at outlet and some value for total pressure at inlet to get desired flow rate in m^3/s. so i am giving value 100 at inlet and zero at outlet and operating pressure is zero. are these BC's true or will give me wrong result?

[oozcan]

So, let you re-correct me,

outlet is found in atmospheric field.Is it correct?. That's why you called it ''0'' (zero)

Operating pressure must not be 0, otherwise, that will be a ''vacuum''. Operating pressure is generally 1 atm.

[rsaurabh]

The paper i am following states that zero static pressure at outlet, some value at inlet to get desired 5 litre/minute flow rate. in it there is no mention about operating pressure. but my geometry works for pressure range 80-120 mm Hg.

[oozcan]

Well,

you need to define pressure_inlet BC. and gauge total pressure 100 bar( are you sure, watch out the unit!!), and supersonic/initial gauge pressure is 0,As for, outlet_pressure, gauge pressure is 0, target mass flow rate 5 lt/min (convert to kg/s)

[rsaurabh]

i have done the simulation but the velocity contour has velocity very less velocity compare to original results. there maximum velocity is around 1m/s but mine maximum is coming 0.336m/s. so i am not able to figure out what is the problem here.

[oozcan]

check scale your model in FLUENT. All dimensions are correct or not!,

Then, your fluid domain maybe should be extended if there is heat fluxed wall,

and which model have you defined?,turbulence or laminar, maybe you can need to change your model if you want to have correct result.

[rsaurabh]

i have checked all dimensions are correct and using turbulence model. for your understanding i am attaching my case file here.

https://drive.google.com/file/d/0Byn...ew?usp=sharing

[oozcan]

I have checked it, I am going to adjust