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Old   February 26, 2008, 04:11
Default Zero pressure gradient
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Hallo, I need to implement zero pressure gradient as boundray condition. But the only BC s are opening and outlet BCs. How could I specify zero pressure gradient BC?

Thanks in advance, --Selim
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Old   February 26, 2008, 17:59
Default Re: Zero pressure gradient
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Is this an inflow or outflow condition?

At an outlet, the "Average Static Pressure" and default "Specified Mass Flow" options are both zero gradient (i.e. the local mass flow rate is allowed to float). If you expand the mass flow options, the default is "Scale Flows", which is the zero gradient option. Others include the "Scale Pressure" option, which allows you to specify the pressure profile and "Constant Flux", which (as the name suggests) pulls mass out at a constant rate.

On Openings there is a zero gradient option for both momentum and turbulence, but the pressure must be specified.

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Old   February 27, 2008, 04:00
Default Re: Zero pressure gradient
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Thanks a lot,

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