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Re: Segregated Solver option in FLUENT 13

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Old   June 1, 2013, 06:40
Default Re: Segregated Solver option in FLUENT 13
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Yash Ganatra
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I am working on a natural convection problem and after going through some of the discussions I found that it's better to start with a SEGREGATED solver.

However, I am unable to located that in FLUENT 13. Can someone please tell where is that option? The tutorials I have referred use FLUENT 6 and it's fairly easy to spot the option there. I am able to locate pressure and density based solver though.

Thanks in advance,
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Old   June 1, 2013, 12:02
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The default algorithm for FLUENT is segregated.

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Old   June 1, 2013, 12:52
Default Re: Segregated Solver Option in FLUENT 13
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Thank you for your reply. But suppose a plot is plotted, in the bottom right side of the display window it's written FLUENT(2dp,pbs.....) whereas for FLUENT 6 it is clearly written segregated.

Suppose we want to make it Coupled how can we change?

Thanks,
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Old   June 1, 2013, 13:05
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The by default pressure velocity coupling method is SIMPLE which is segregated method. Use a drop down menu to select coupled instead.

Have a look at FLUENT documentaiton. These are pretty basic questions.

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Old   June 2, 2013, 04:59
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There are three type of solvers in Fluent :

1. Pressure based (segregated in older version Fluent 6.3 )
Here transient flows are solved in implicit manner
Options available are : SIMPLE, SIMPLER, SIMPLEC

2. Density based (Coupled solver in older version). Here you have two options for transient simulation. Either implicit or explicit. Explicit is recommended when time step is of same order as CFL ~ 1 other implicit is recommended.

3. Pressure based coupled solver (new addition) : It is mix of above two solvers. It is recommended when velocity - pressure coupling is strong and gives you solution in less no of iteration than pressure based segregated solvers (for example 300-400 iterations for segregated to 25-30 for coupled pressure solver )

How to make choice

1. For higher Mach no flows (higher compressibility effect). Choose density based with implicit option. It is memory pig and may require double RAM as compared to segregated solver.
2. For low Mach no flows if accuracy is more important use pressure based coupled solver. Pressure based coupled solver can also be used for moderate Mach no.
3. For flow where coupling is loose between pressure and velocity field use segregated solver (pressure + SIMPLE type)

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Old   June 2, 2013, 08:17
Default Re: Segregated Solver Option in FLUENT 13
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Thank you very much
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