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-   -   A challenge for you in cfd(pipe problem) (http://www.cfd-online.com/Forums/cfx/98937-challenge-you-cfd-pipe-problem.html)

mahesh9 March 22, 2012 07:09

A challenge for you in cfd(pipe problem)
 
2 Attachment(s)
Background and Problem Statement:
The manifolds used in the Actuation systems of the aircraft have the control logic inside it. This manifold will house different kind of valves, transducers, solenoids etc. It is always a challenge to provide the flow path between different components with the minimum pressure drop through the flow holes created for the purpose keeping in mind the structural failures thus maintaining thickness of material between the flow holes. And also to keep the total size to minimum and within the specified envelope. So there is always a need to have the flow paths having different orientations within the manifold.
The current problem addresses this requirement using CFD to execute the comparative studies of the pressure drop for various orientations of the flow paths.
The geometry needs to be created using any CAD software similar to the picture below with different orientations.Extract the fluid domain, and bring into theANSYS CFX software to perform the analysis
Inputs:
• Inlet pressure = 5000 psi
• Flow rate = 16 cis
• Fluid: Skydrol/Red Oil.
• (Properties can be obtained from the internet)
• Min dia holes: 0.2 in
• Max dia of flow holes: 0.35 in
• Test block size: 3.5 in *3.5in *1.75in


Expected outputs:
• Pressure and velocity plots for at least 2 different orientations of the flow paths
• Hand calculation of the pressure drop using the standard flow equations and verify the CFD results

THE DIAGRAM OF THE MANIFOLD IS ATTACHED.PLEASE FIND THE ATTACHMENT AND GIVE A REPLY.there is only one inlet and one outlet.the small hole which is made in the block is to connect inlet pipe and outlet pipe.small diameter pipe is to connect inlet and outlet pipes.later on it will be closed with a cap.

tauqirnawaz March 22, 2012 08:22

What is your question? :rolleyes:

mahesh9 March 22, 2012 10:45

Quote:

Originally Posted by tauqirnawaz (Post 350877)
What is your question? :rolleyes:

apply boundary conditions according to values and design an orientation with minimum pressure drop or else calculate for same orientation

tauqirnawaz March 22, 2012 11:39

Quote:

Originally Posted by mahesh9 (Post 350907)
apply boundary conditions according to values and design an orientation with minimum pressure drop or else calculate for same orientation

How much is the prize money? :D

Far March 22, 2012 15:52

Quote:

How much is the prize money?
I guess should be proportional to question size and no of questions ;)

ghorrocks March 22, 2012 18:01

Have you considered using the design optimisation stuff built into Workbench?

But this looks a little trivial for that - why not simply make the flow holes as big as possible and as short as possible? That is going to be pretty close to minimum flow resistance. There will be small optimisations to be had by corner details, but I suspect they will be minor.

mahesh9 March 23, 2012 00:26

Quote:

Originally Posted by tauqirnawaz (Post 350928)
how much is the prize money? :d

prize money 1000 usd

Far March 23, 2012 00:45

:rolleyes: you sure :) isn't it very low compared to license fees and man hours required :D

Do you want to extract the fluid volume and apply the appropriate boundary condition?

tauqirnawaz March 23, 2012 19:05

Quote:

Originally Posted by Far (Post 351033)
:rolleyes: you sure :) isn't it very low compared to license fees and man hours required :D

Do you want to extract the fluid volume and apply the appropriate boundary condition?

not worth it, should at least be 10,000.00 :o

Far March 24, 2012 11:53

Could you please explain your problem exactly?


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