[mostanad]

hello everybody
i am investigating about boundary layer flow over cavity. i am using fluent for simulating this geometry. my solution doesn't converge. i know it's because boundar conditios. is any bodey say me boundary conditiod specially in outlet.

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[MAK_JUST_University]

Dear Mohammad

Inlets should be specified through static pressure, mass flow rate or velocity
Walls should be specified as wall boundary condition (no slip)
outlet might be specified outflow or zero relative pressure

in addition you might define an enclosure to define the fluid domain

Yours
Moh'd

[mostanad]

Originally Posted by MAK_JUST_University

Dear Mohammad

Inlets should be specified through static pressure, mass flow rate or velocity
Walls should be specified as wall boundary condition (no slip)
outlet might be specified outflow or zero relative pressure

in addition you might define an enclosure to define the fluid domain

Yours
Moh'd

thank you for replying to me.
if i write an fortran code for this domain, which b.c can be use for outlet??? the procedure of solving is solving of vorticity-stream function equatios. can i use fully developed flow for outlet??? how i should draw after cavity for this condition???

[MAK_JUST_University]

you are welcome
if i were you i would assume the pressure at the outlet as zero gage pressure where the outlet stream is opened to the atmosphere
i'm not sure if you can assume a fully developed flow you have to check the geometry and the developing length

Why dnt you perform the simulation using commercial package like Ansys, Comsol or open foam ?!!

Yours
Moh'd

[mostanad]

Originally Posted by MAK_JUST_University

you are welcome
if i were you i would assume the pressure at the outlet as zero gage pressure where the outlet stream is opened to the atmosphere
i'm not sure if you can assume a fully developed flow you have to check the geometry and the developing length

Why dnt you perform the simulation using commercial package like Ansys, Comsol or open foam ?!!

Yours
Moh'd

yes, my work has two side, one side is by the commercial codes such as fluent, but another is coding in fortran.