# A challenge for you in cfd(pipe problem)

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March 22, 2012, 07:09
A challenge for you in cfd(pipe problem)
#1
New Member

mahe
Join Date: Mar 2012
Posts: 7
Rep Power: 6
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.
Attached Images
 Capture.JPG (16.6 KB, 15 views) Untitled.jpg (7.3 KB, 8 views)

Last edited by mahesh9; March 22, 2012 at 07:36.

 March 22, 2012, 08:22 #2 Member   Raja_Bhai Join Date: Feb 2012 Location: UK Posts: 40 Rep Power: 7 What is your question?

March 22, 2012, 10:45
#3
New Member

mahe
Join Date: Mar 2012
Posts: 7
Rep Power: 6
Quote:
 Originally Posted by tauqirnawaz What is your question?
apply boundary conditions according to values and design an orientation with minimum pressure drop or else calculate for same orientation

March 22, 2012, 11:39
#4
Member

Raja_Bhai
Join Date: Feb 2012
Location: UK
Posts: 40
Rep Power: 7
Quote:
 Originally Posted by mahesh9 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?

March 22, 2012, 15:52
#5
Super Moderator

Sijal
Join Date: Mar 2009
Posts: 4,358
Blog Entries: 6
Rep Power: 45
Quote:
 How much is the prize money?
I guess should be proportional to question size and no of questions

 March 22, 2012, 18:01 #6 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 14,096 Rep Power: 109 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.

March 23, 2012, 00:26
#7
New Member

mahe
Join Date: Mar 2012
Posts: 7
Rep Power: 6
Quote:
 Originally Posted by tauqirnawaz how much is the prize money? :d
prize money 1000 usd

 March 23, 2012, 00:45 #8 Super Moderator   Sijal Join Date: Mar 2009 Location: Islamabad Posts: 4,358 Blog Entries: 6 Rep Power: 45 you sure isn't it very low compared to license fees and man hours required Do you want to extract the fluid volume and apply the appropriate boundary condition?

March 23, 2012, 19:05
#9
Member

Raja_Bhai
Join Date: Feb 2012
Location: UK
Posts: 40
Rep Power: 7
Quote:
 Originally Posted by Far you sure isn't it very low compared to license fees and man hours required Do you want to extract the fluid volume and apply the appropriate boundary condition?
not worth it, should at least be £10,000.00

 March 24, 2012, 11:53 #10 Super Moderator   Sijal Join Date: Mar 2009 Location: Islamabad Posts: 4,358 Blog Entries: 6 Rep Power: 45 Could you please explain your problem exactly?

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