Define flux type boundary condition for UDS

mvee · October 7, 2013, 01:43

Hi
I am solving an additional transport equation through UDS say uds0. I would like to define the bounday condition for this through following expression:
$\frac{\partial{UDS0})}{\partial{x}}={a}+{b}*{y}$

How can I define this.

Thank you
mvee

mvee · October 9, 2013, 07:32

can anyone respond?

C.C · October 10, 2013, 06:23

Hi,

I think that you can use DEFINE_PROFILE in your UDF. In the UDF manual says that "You can use DEFINE_PROFILE to define a custom boundary profile that varies as a function of spatial
coordinates or time".
I hope it can help you...
Regards

mvee · October 11, 2013, 01:13

Hi CC

Thanks for your response

You are correct, define_profile is the option. But the thing is I want to have, $\frac{\partial{UDS0}}{\partial{x}}$ , which is not directly possible through define_profile.

What other option can I try?

Thanks
Mvee

C.C · October 11, 2013, 05:06

Hi mvee,

What type is your BC?
If it's a wall BC I think that you can use DEFINE_PROFILE to define a F_PROFILE(c,t,i) with your expression and then in
BoundaryCondition->Wall->UDS(0)->SpecifiedFlux
you can select your BC. As the flux option is selected you are given the derivative.
Sorry, I don't know other option that you can use.

C.C

October 7, 2013, 01:43	Define flux type boundary condition for UDS	#1
mvee Senior Member Vaze Join Date: Jun 2009 Posts: 172 Rep Power: 16	Hi I am solving an additional transport equation through UDS say uds0. I would like to define the bounday condition for this through following expression: $\frac{\partial{UDS0})}{\partial{x}}={a}+{b}*{y}$ How can I define this. Thank you mvee

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October 9, 2013, 07:32		#2
mvee Senior Member Vaze Join Date: Jun 2009 Posts: 172 Rep Power: 16	can anyone respond?

October 10, 2013, 06:23		#3
C.C Member CC Join Date: Jun 2011 Posts: 73 Rep Power: 14	Hi, I think that you can use DEFINE_PROFILE in your UDF. In the UDF manual says that "You can use DEFINE_PROFILE to define a custom boundary profile that varies as a function of spatial coordinates or time". I hope it can help you... Regards

October 11, 2013, 01:13		#4
mvee Senior Member Vaze Join Date: Jun 2009 Posts: 172 Rep Power: 16	Hi CC Thanks for your response You are correct, define_profile is the option. But the thing is I want to have, $\frac{\partial{UDS0}}{\partial{x}}$ , which is not directly possible through define_profile. What other option can I try? Thanks Mvee

October 11, 2013, 05:06		#5
C.C Member CC Join Date: Jun 2011 Posts: 73 Rep Power: 14	Hi mvee, What type is your BC? If it's a wall BC I think that you can use DEFINE_PROFILE to define a F_PROFILE(c,t,i) with your expression and then in BoundaryCondition->Wall->UDS(0)->SpecifiedFlux you can select your BC. As the flux option is selected you are given the derivative. Sorry, I don't know other option that you can use. C.C