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fluid flow around a half burn pipe

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Old   July 16, 2010, 10:33
Default fluid flow around a half burn pipe
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Destry Marulitua Siagian
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Dear all..

hi my name is Destry
im a student of ITB (Bandung Institute of Technology) Indonesia
major in ocean engineering
I'm working on my thesis now about fluid flow around the pipe..
I have done a laboratory test.
and now need a numerical simulation using FLUENT
I examine the flow of water around the pipe that partly buried.
There are two cases:
single pipe and three parallel pipes ..

I am just learning this software ..
Please help me how to simulate these with FLUENT
to produce velocity and pressure around the pipe ..
thanks a lot

Regards

Destry
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Old   July 16, 2010, 10:50
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What specifically do you need help with?
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Old   July 16, 2010, 10:55
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Destry Marulitua Siagian
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i have make the meshing with gambit,, (but dont know it is a good meshing)
but really dont know how to run them in FLUENT,,,
so,, i need steps how to run them n produce the velocity and pressure around the pipe
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Old   July 16, 2010, 11:17
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Have you gone through some of the fluent tutorials? That's really the best way to get started and learn how to use the software. Also, the user's guide is actually pretty good at guiding you towards which solver to use, turbulence model, etc. Do you have some specific questions about the software?
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Old   July 16, 2010, 11:24
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Quote:
Originally Posted by Chris D View Post
Have you gone through some of the fluent tutorials? That's really the best way to get started and learn how to use the software. Also, the user's guide is actually pretty good at guiding you towards which solver to use, turbulence model, etc. Do you have some specific questions about the software?


actually i have...
but the tutorials use a different model with mine,,
i have try using the guidance but produce a bad result...

btw,,,
when running this software will we get a set data of pressure and velocity in each grid?
i havent found them yet when i finish run my cases
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Old   July 16, 2010, 11:29
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Yes, you should be able to view the velocity and pressure data for your case. You can display them by going to Display-->Contours. Maybe you could post some plots of your solution and grid? Also, what solver are you using, what are your boundary conditions, etc?
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Old   July 16, 2010, 11:43
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here i attach the grid and some of the fluent result..
i use steps in fluent tutorials to produce them http://flowlab.fluent.com/exercise/pdfs/cylinder.pdf

so,, the data (pressure and velocity at each grid) will auto saved?
how to open them?
do they available in notepad format?
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Old   July 16, 2010, 11:51
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The data can be saved at whatever interval you choose by going to File-->Write-->Autosave. You can post-process with fluent, or you could use something else, but I'm not really sure why you want to open the data file with a text editor, as the data is not in a reader-friendly format.

Regarding your simulation, what are your boundary conditions? Also, you might think about moving your inflow boundary farther upstream and refining the mesh in the near-wall regions.
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Old   July 16, 2010, 12:01
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in gambit you mean?

the boundary condition:
velocity inlet
outflow
and wall for pipe and upper n bottom area..

i need the data (velocity and pressure) to calculate scouring with empirical formulas
so i cant get them?
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Old   July 16, 2010, 12:14
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Quote:
Originally Posted by Destry View Post
in gambit you mean?

the boundary condition:
velocity inlet
outflow
and wall for pipe and upper n bottom area..

i need the data (velocity and pressure) to calculate scouring with empirical formulas
so i cant get them?
I'm not sure what scouring is, but where do you need the data to calculate it? From the wall regions? I doubt you need the data from the entire domain. Check out Chapter 4 in the fluent 6.3 user's guide for information about exporting data. You might even be able to create a custom field function in fluent to do this for you (Chapter 30.)

Regarding the actual simulation, you might try using a structured grid to more adequately and efficiently resolve the near-wall region. Something like this:

cylinder-01.jpgcylinder-02.jpg
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Old   July 16, 2010, 12:24
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Quote:
Originally Posted by Chris D View Post
I'm not sure what scouring is, but where do you need the data to calculate it? From the wall regions? I doubt you need the data from the entire domain. Check out Chapter 4 in the fluent 6.3 user's guide for information about exporting data. You might even be able to create a custom field function in fluent to do this for you (Chapter 30.)

Regarding the actual simulation, you might try using a structured grid to more adequately and efficiently resolve the near-wall region. Something like this:

Attachment 4097Attachment 4098


i need the average data in front of the pipe after fluid crossing the pipe...
may i get the mesh?
if it is possible,,may u sent them to my email (sgn_mathiew@yahoo.com) as reference for me making grid in 2nd task (the parallel case)

the scouring is such effect of fluid flow around pipe...
actually bottom area is not a wall... but soil,,
how i define them in gambit?
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Old   July 16, 2010, 13:16
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btw,,,,
thx for helping me today....




Regards

Destry
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Old   July 16, 2010, 13:39
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I hope that the images I attached can be enough of a reference, as I don't feel comfortable sending you the actual grid.

Regarding the wall boundary condition: I you can't set a "soil" boundary condition, but you can set a value for the wall surface roughness to simulate the soil. That might be enough to get you what you need. Although, I might not understand exactly what you're asking.
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Old   July 16, 2010, 21:42
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ok...

thx for helping....


Regards


Destry
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