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Forum: Main CFD Forum

July 21, 2014, 06:34

Replies: 37

inlet has higher pressure than outlet in axial flow fan

Views: 4,543

Posted By Aadhavan

Hi, I think your BC's are wrong, I am...

Hi,
I think your BC's are wrong, I am working on axial fan with the following BC's

inlet --> fixedValue or flowRateInletVelocity
outlet --> fixedMeanValue (pressure (0)) or you can try...

Forum: Main CFD Forum

November 27, 2013, 01:41

Replies: 37

inlet has higher pressure than outlet in axial flow fan

Views: 4,543

Posted By Aadhavan

Hi There, I am working on axial...

Hi There,
I am working on axial fan, I am using mass flow rate inlet and fixedMeanvalue (0) pressure outlet. (OpenFOAM)

Regarding your convergence, try this BC. still if you are not...

Forum: Main CFD Forum

November 28, 2012, 11:03

Replies: 37

inlet has higher pressure than outlet in axial flow fan

Views: 4,543

Posted By Aadhavan

Hi Vicarious, Thanks for the...

Hi Vicarious,
Thanks for the quick and informative reply, I think it is not possible to use DNS for fan simulation in openFOAM. I am not sure about it.

Thanks,
Aadhavan

Forum: Main CFD Forum

November 28, 2012, 08:09

Replies: 37

inlet has higher pressure than outlet in axial flow fan

Views: 4,543

Posted By Aadhavan

Hi Vicarious, I have seen in...

Hi Vicarious,
I have seen in Wiki or CFD online, "k-epsilon is inappropriate choice for problem such us compressor" is it applicable for fan as well.
If so which turbulence model...

Forum: Main CFD Forum

November 28, 2012, 03:36

Replies: 37

inlet has higher pressure than outlet in axial flow fan

Views: 4,543

Posted By Aadhavan

Hi Vicarious, Thanks for...

Hi Vicarious,
Thanks for your help so for, I found the mistake and fixed it.
the fan was spinning anti-clock wise direction instead of clock wise direction.
I ran the simulation...

Forum: Main CFD Forum

November 19, 2012, 13:57

Replies: 37

inlet has higher pressure than outlet in axial flow fan

Views: 4,543

Posted By Aadhavan

Hi Vicarious, I have done...

Hi Vicarious,
I have done small changes in inlet and outlet. the simulation is going, let us see what is the result tomorrow.

Thanks,
Aadhavan

Forum: Main CFD Forum

November 19, 2012, 06:47

Replies: 37

inlet has higher pressure than outlet in axial flow fan

Views: 4,543

Posted By Aadhavan

Hi Vicarious, I hope the...

Hi Vicarious,
I hope the mesh is not a problem, because I have done some simulation with the same mesh. Now I have changed only the BC.
I feel mesh wont be a problem.

Thanks...

Forum: Main CFD Forum

November 18, 2012, 04:36

Replies: 37

inlet has higher pressure than outlet in axial flow fan

Views: 4,543

Posted By Aadhavan

Hi Vicarious, thanks for the...

Hi Vicarious,
thanks for the reply, i have asked that information just for clarification.
I have tried to run the case, but it giving fatal error as follows,

--> FOAM FATAL IO...

Forum: Main CFD Forum

November 17, 2012, 04:54

Replies: 37

inlet has higher pressure than outlet in axial flow fan

Views: 4,543

Posted By Aadhavan

Hi Vicarious, I have...

Hi Vicarious,
I have attached the pdf, please have look, I got some other reply as well in that "if I keep constant total pressure for my whole domain, there will be no dynamics" ...

Forum: Main CFD Forum

November 16, 2012, 15:21

Replies: 37

inlet has higher pressure than outlet in axial flow fan

Views: 4,543

Posted By Aadhavan

Hi Vicarious, Yes I am...

Hi Vicarious,
Yes I am wrong, I have attached the wrong file, I am rally sorry for that.
I will sent it to you tomorrow morning

thanks,
Aadhavan

Forum: Main CFD Forum

November 16, 2012, 08:09

Replies: 37

inlet has higher pressure than outlet in axial flow fan

Views: 4,543

Posted By Aadhavan

Hi Vicarious, I am back, I...

Hi Vicarious,
I am back, I am trying to implement the idea in to openFoam,
I am bit confused, I have attached my boundary condition as pdf for your consideration.
please have...

Forum: Main CFD Forum

November 15, 2012, 16:47

Replies: 37

inlet has higher pressure than outlet in axial flow fan

Views: 4,543

Posted By Aadhavan

Yes, fan works with moderate pressure. actually...

Yes, fan works with moderate pressure.
actually i need to get the pressure difference approximately 200 Pa,

ok Vicarious, I will implement tomorrow,
I am not able to digest the inlet pressure,...

Forum: Main CFD Forum

November 15, 2012, 16:11

Replies: 37

inlet has higher pressure than outlet in axial flow fan

Views: 4,543

Posted By Aadhavan

Good, As I said before my dynamic pressure is...

Good, As I said before my dynamic pressure is 64.5 Pa
P0=Pd+Ps
P0=101325 Pa
So my Ps = 101260.5 Pa

Now my Inlet : total+static
outlet: 101260.5Pa

is it correct?

Forum: Main CFD Forum

November 15, 2012, 15:39

Replies: 37

inlet has higher pressure than outlet in axial flow fan

Views: 4,543

Posted By Aadhavan

Hi Vicarious, Thank you, I...

Hi Vicarious,
Thank you, I will try to implement it tomorrow.
since I am using openFOAM, I dont know what is the usage, I will have a look.

set it as your inlet total and...

Forum: Main CFD Forum

November 15, 2012, 14:54

Replies: 37

inlet has higher pressure than outlet in axial flow fan

Views: 4,543

Posted By Aadhavan

Hi Vicarious, thank you for...

Hi Vicarious,
thank you for your message, what value I need to use for P0.
do i need to use 101325 Pa.
or how can I calculate.

Thanks,
Aadhavan

Forum: Main CFD Forum

November 15, 2012, 12:40

Replies: 37

inlet has higher pressure than outlet in axial flow fan

Views: 4,543

Posted By Aadhavan

Hi Vicarious, Thank you for...

Hi Vicarious,
Thank you for your kind information, I bit struggling to implement your information.

I have calculated the dynamic pressure = 64.50 pa
can you please tell how...

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