Notes
 

If anybody have these notes please email them to angrula@gmail.com

This is just a summary on fan boundary condition.
1. You need an interior boundary between two cell zones not interface. It means that the mesh must be conformal over the surface that fan is supposed to e implement.
2. Easily switch the boundary condition from 'interior' to 'fan'.
3. Now you can set the fan parameters. You can start with constant pressure jump to be sure about the direction of the fan.

Fan BC is a 2-D surface. To model 3-D fan e.g. centrifugal fan, other approaches are needed.

Notes
 

If anybody has the note, can email me? I will be very grateful... my email id: ttaru.me07@gmail.com

Fan boundary condition unexpected results
 

Hi,
I am using the fan boundary condition is FLUENT.

I would like to know:
1)Which pressure (static or total) is the one that you specify when setting up the case?
2)Does the total temperature change across the fan?

Please, if you know the answer offer me some help.
Also I would appreciate if anybody could send me the "fan" notes. My email is: crespoa.javier[AT]gmail.com

Thanks!!

The fan boundary condition is supposed to model an axial fan.
1. The specified pressure jump is static.

Thanks. However, total pressure also changes across a fan.

I ran a calculation in which I specified a pressure rise of 20kPa in the fan boundary condition menu. Looking at the results by doing "Surface integrals" of static pressure and total pressure just before the fan and just after the fan" (both area-weighted and mass weighted offered similar results) the static pressure rise I got was 23.8KPa and the total pressure rise I got was 21.3 KPa. It was an inviscid calculation and the "ideal-gas" model was used to model the air. The SIMPLE scheme was used and 2nd order methods were employed. I refined the mesh (but only in the near fan region) and the results I got were the same

As you can see, neither of the pressure differences matched what I specified and even the difference in total pressure was closer to the specified value of 20 KPa. What do you think?

Total pressure by definition is the sum of static and dynamic pressure. Dynamic pressure is rho*v^2/2. So, if the velocity does not get changed, the dynamic pressure would be constant for incompressible simulation on both sides of the fan. In the other word, if your simulation is incompressible, then the dynamic pressure won't change unless the cross sectional area changes on both sides of the fan.
Run your simulation for many iterations. According to the cases that I ran, it takes long time for the pressure jump to converge to specified value.
Although the values that you mentioned are close to 20, you can test cell based and node base methods. Sometimes, it makes difference.

Simulation of hollow pipe with tool in it
 

Hey Guys,

I need help with something. I hope somone can help me. Its my thesis and am stuck in it.:confused::confused:

It is a hollow pipe with a spherical tool in it. Fluid enters the pipe from one end and exits the other way. The tool has a dia of 282mm. the ID of the pipe is 303.24mm. i have done some simulation but i want to know if it is right. I am getting so confused with the setup. I want to find the change in pressure across the pipe. I tried attaching the Ansys fluent folder but its too big to be attached here. My email id is mohamed.shabir92@yahoo.com.

Can anyone pls help me with it or send a mail so that i can send u the files. Thanks in advance.

And i am so dumb i do not know how to post this question in a seperate topic. Struggling a lot

Thanks for your response. The fluid under study is air and I model it as an ideal gas, so the density can change. My domain is a 2-D rectangle. At the inlet I specify aa total pressure of 100KPa, I choose 20KPa for the pressure jump in the fan boundary condition menu. Finally I specify an outlet static pressure of 110KPa. When i look at the results(converged to 10^-6 of residuals) the Mach at the inlet is
0.529 while the Mach at the outlet is 0.389, so velocity changes.

I ll try your suggestion.of node based approach. Does anybody else have other ideas?

fan boundary condition
 

Hi!!!

If anybody has the note, can email me? I will be very grateful... my email id:

mattia.delfavero@gmail.com

HI, could I have the file?
Thanks
michele.roffi@hotmail.it

hello ravi,

i hope i can also get your notes on boundary conditions of jet fans.
driverwreckless@gmail.com is my email.
thanks.

Help
 

cheers

Ravi
I need the mentioned notes too so, please send me them on Mohamed.elkhial2011@gmail.com

Thank you for your help

Sherif
Gomaa, Sherif is offline

Fan Model
 

Hello
can I have also the note on the fan model please?
My E-mail: lusanchezrivera@gmail.com

Thank you very much

Can anyone just share the notes here? I appreciate it.

anyone has the notes please?

yankicob@gmail.com

Hello Ravi, I am working on the similar problem. If possible can you give notes related to it? Thank you

Here is my mail address: kailasmuke37@gmail.com

Can anyone send me the notes my email is rrdop@uol.com.br? I working with a car radiator and i think i'm setting something wrong beacause the flow dont go out from my fan zone. Do someone knows what i have to do? :confused:

Hello everyone,

Can anyone please send me the Fan notes? My email id is chetankishore@gmail.com

hello, can anyone send the notes about fan boundary condition?

matteo.capozucca at gmail.com

thank you very much