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Old   August 8, 2005, 04:00
Default help in galvanising sheet problem
  #1
MANOJ
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hellow,

i have constructed a cubical furnace of 300mm in dimension. inside it a thin sheet is kept. i have given the velocity inlet boundary condition at the sheet inlet and outflow condition at the sheetoutlet. the four sides of the sheet are given the boundary condition of wall.the fluid used is water. if i take sheet as solid than the solution doesnot converge. so i have taken sheet as fluid. please help me to solve the problem by taking the sheet as solid.i also want your suggestion whether the sheet treated as fluid is correct or not. thanks a lot.

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Old   August 8, 2005, 11:14
Default Re: help in galvanising sheet problem
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Swarup
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if your sheet is moving then this is a moving mesh problem. you should take a solid sheet, why fluid?

Swarup
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Old   August 9, 2005, 02:28
Default Re: help in galvanising sheet problem
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MANOJ
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hi swarup,
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Old   August 9, 2005, 02:32
Default Re: help in galvanising sheet problem
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MANOJ
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hi swarup,

i have tried moving mesh problem by taking the sheet as solid but error comes telling that FLUENT received fatal signal. so i could not proceed further.please tell your suggestion about solving this problem.thanks a lot.

manoj
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Old   August 9, 2005, 10:49
Default Re: help in galvanising sheet problem
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Swarup
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Hi Manoj, there is something wrong with your problem set-up. i cannot elaborate much however except telling you that you should take a look at chapter 10 of user guide. incidentally, i am also looking for some material on this problem. one lady is trying this problem and facing similar errors. i can give her e-mail ID if you want. i will get back to you soon.

Swarup.
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Old   August 9, 2005, 18:24
Default Re: help in galvanising sheet problem
  #6
Laika
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Swarup,

if the looked for results are a statonary flow solution, it's not always necessary to use moving mesh for a moving sheet.

If e.g. you have a moving sheet, and you need to account for the heat-transfer due to the 'solid convection' with the sheet, you can create a thin fluid zone as being the sheet. In this zone you have an inlet-velocity = sheet velocity, a free outlet, and two or four walls wich will be moving walls with, of course, the sheet velocity. As a result you have no relative motion in this sheet-fluid-zone, and if you set this zone as 'laminar zone' and give the fluid 'metal' material a very high viscosity (not necessary, but just to be onthe safe side), this zone actually behaves as a solid, but with that difference taht even in a stationary calculation the convection of heat is being calculated. The effects of the movement on the real fluid is easily taken into account by the moving wall boundaries. This procedure can save huge amounts of time.

someone any comments?

cheers, Laika, still orbiting
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Old   August 13, 2005, 03:09
Default Re: help in galvanising sheet problem
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manoj
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hellow,

i have carried out the galvanising sheet problem in the way shown by you. i am getting the converge solution but when i carry out the post processing , in that vectors of temperature , the temperature of sheet in and sheet out remain same. and all sides temperature comes same .so heat transfer is not properly taking place. please help me to solve this problem.

thanks a lot.

manoj
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Old   August 13, 2005, 09:20
Default Re: help in galvanising sheet problem
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Laika
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your "frozen fluid region" that is your sheet, is separated from the fluid zone by a wall and it's shadow. The temerature boundary condition for these two walls need to be 'coupled'. Is that the case in your simulation?

What temperature would you expect? What values for the heat transfer coefficient would you axpect. Are temperatures in the fluid zone ok?

good luck,

Laika, still orbiting
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Old   August 22, 2005, 02:29
Default Re: help in galvanising sheet problem
  #9
MANOJ
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I getting same temperature in all zones of moving sheet in each side-1,side-2 side-3,ide-4 and inlet and outlet temp is also same. if u want whole detail about my problem i send u by mail if u give u e-mail id my mail manojprasad79@yahoo.co.in thanking u manoj
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