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-   -   How to input transient pressure data as BC in pre? (https://www.cfd-online.com/Forums/cfx/22124-how-input-transient-pressure-data-bc-pre.html)

 User February 3, 2006 03:38

How to input transient pressure data as BC in pre?

Hi.. I have two column of experimental data: time t & transient static pressure P(t) stored in a csv file. I wish to use P(t) as my outlet boundary condition in transient simulation.

However, I failed to initialise these data in Pre V.10.

I get an error message when I use "initialise profile data":

Can anyone give me some ideas how to input the transient pressure data to Pre so that I can specify P(t) at the outlet BC.

 Camilo Costa February 3, 2006 07:42

Re: How to input transient pressure data as BC in

Exist in CFX help one tutorial that explain this, but i fogive was that!!

 User February 3, 2006 10:00

Re: How to input transient pressure data as BC in

Hi Camilo,

I found 5 (CFX 10) tutorials that talk about transient simulation.

Tutorial 4:Flow from a circular vent

Tutorial 6:Buoyant Flow in a partitioned cavity

Tutorial 12:Flow in an axial rotor/stator

Tutorial 17:Air Conditioning simulation

Tutorial 20:Fluid Structure Interaction and Mesh deformation

Tutorial 4 use formula ExpFunction to express transient term and do not use data imported from a text/csv file.

Tutorial 6 seems to use a fixed value for BC.

can't find any relavant info in Tutorial 12 as well.

Tutorial 17 uses the user subroutines ect but I can't find any methods to input t & P(t) from a csv file and use them for boundary condition.

I can't find any relavant info in Tutorial 20 either.

Did I miss out anything in tutorial? Would you mind to tell me which tutorial has the information I need? I have already spend hours to hunt for it.

Thank you very much.

 Camilo Costa February 3, 2006 12:33

Re: How to input transient pressure data as BC in

I will sugest this!!

go in expressions anda set this example:

"2*sin((t/1[s]))[Pa] + 415[Pa]" ---> (CALL THIS VP)

clic in plot and define of 0 at 10s.

The pressure varable with time.

Go to bonduary condition that have inlet or outlet and clic in "Enter Expression" and put the name "VP"

 Chirag Jayswal February 6, 2006 02:15

Re: How to input transient pressure data as BC in