Basic Questions Regarding UDS and UDFs

kiangtengl · October 21, 2016, 00:30

In my problem, I have two bodies [ A | B ]

Let's say I have defined a UDS (i.e. moisture content) which is initialized to some value in A.

If I use a DEFINE_PROFILE at the interface between A and B representing the flux of A into B, will A be depleted over time in a transient solution? (Due to mass transfer from A to the interface)

I'm still new to fluent so please tell me if you need more information.

sbaffini · October 22, 2016, 07:05

You can't do what you describe in Fluent, but just because you don't actually need to.

As you are just fixing the exchange between A and B, you can simulate them separately. B is just fine by itself. I have some doubts on the feasibility of fixing the outlet profile in A (as that tipically requires a velocity inlet boundary condition), but that might work (sometimes it does for the velocity).

October 21, 2016, 00:30	Basic Questions Regarding UDS and UDFs	#1
kiangtengl New Member Lim Kiang Teng Join Date: Oct 2016 Posts: 2 Rep Power: 0	In my problem, I have two bodies [ A \| B ] Let's say I have defined a UDS (i.e. moisture content) which is initialized to some value in A. If I use a DEFINE_PROFILE at the interface between A and B representing the flux of A into B, will A be depleted over time in a transient solution? (Due to mass transfer from A to the interface) I'm still new to fluent so please tell me if you need more information.

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October 22, 2016, 07:05		#2
sbaffini Senior Member Paolo Lampitella Join Date: Mar 2009 Location: Italy Posts: 2,192 Blog Entries: 29 Rep Power: 39	You can't do what you describe in Fluent, but just because you don't actually need to. As you are just fixing the exchange between A and B, you can simulate them separately. B is just fine by itself. I have some doubts on the feasibility of fixing the outlet profile in A (as that tipically requires a velocity inlet boundary condition), but that might work (sometimes it does for the velocity).