Boundary Conditions Validity

o_mars_2010 · January 14, 2014, 00:16

Is the boundary condition applied in this system is valid ??
I am using staggered grid & fractional step method to solve Incompressible NS Eqs.

cfdivan · January 15, 2014, 17:18

Greetings,

I do not really understand what you want to test. It looks like you will be able to simulate nothing!

Regards,

o_mars_2010 · January 15, 2014, 20:25

Quote:

Originally Posted by cfdivan

Greetings,

I do not really understand what you want to test. It looks like you will be able to simulate nothing!

Regards,

There is an oscillating body inside the domain, which will cause an oscillating flow.

AshwaniAssam · January 18, 2014, 12:53

The Dirichlet pressure boundary condition we can apply only when the flow will be fully developed at the outlet.

o_mars_2010 · January 18, 2014, 12:54

Quote:

Originally Posted by AshwaniAssam

The Dirichlet pressure boundary condition we can apply only when the flow will be fully developed at the outlet.

Based on Re the Channel is long enough to assure fully developed flow at both ends.

AshwaniAssam · January 18, 2014, 13:57

The boundary condition then seems fine. Since, the oscillating body inside will be something like the source term for Navier-Stokes. Also, how you are giving these oscillating conditions.

o_mars_2010 · January 18, 2014, 14:06

Quote:

Originally Posted by AshwaniAssam

The boundary condition then seems fine. Since, the oscillating body inside will be something like the source term for Navier-Stokes. Also, how you are giving these oscillating conditions.

Immersed Boundary Method (IBM)

Vino · January 18, 2014, 16:03

As far as I know, At inlet (velocity to be specified, pressure to be interpolated) and At outlet (velocity to be specified, pressure to be interpolated) for Incompressible flows.

Since I am not working with fractional step method, I don't know whether you can use Pressure boundary condition on both inlet and outlet.

o_mars_2010 · January 18, 2014, 22:20

I am still waiting for any one (has experience) to confirm weather i can or can't use these BC !!!

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January 15, 2014, 17:18		#2
cfdivan Member Join Date: Jun 2011 Posts: 51 Rep Power: 14	Greetings, I do not really understand what you want to test. It looks like you will be able to simulate nothing! Regards,

January 18, 2014, 12:53		#4
AshwaniAssam Senior Member Ashwani Join Date: Sep 2013 Location: Hyderabad Posts: 154 Rep Power: 12	The Dirichlet pressure boundary condition we can apply only when the flow will be fully developed at the outlet.

January 18, 2014, 13:57		#6
AshwaniAssam Senior Member Ashwani Join Date: Sep 2013 Location: Hyderabad Posts: 154 Rep Power: 12	The boundary condition then seems fine. Since, the oscillating body inside will be something like the source term for Navier-Stokes. Also, how you are giving these oscillating conditions.

January 18, 2014, 16:03		#8
Vino Senior Member Vino Join Date: Mar 2013 Posts: 130 Rep Power: 13	As far as I know, At inlet (velocity to be specified, pressure to be interpolated) and At outlet (velocity to be specified, pressure to be interpolated) for Incompressible flows. Since I am not working with fractional step method, I don't know whether you can use Pressure boundary condition on both inlet and outlet.

January 18, 2014, 22:20		#9
o_mars_2010 Member Osman Join Date: Oct 2012 Location: Japan Posts: 53 Rep Power: 13	I am still waiting for any one (has experience) to confirm weather i can or can't use these BC !!!