pressure drop - pipe flow
3 Attachment(s)
Hi all,
I want simulate a pipe flow in fluent... the inlet and outlet are linked by periodic boundary conditions... In the pressure gradient (periodic boundary condition) I have a value, but in the static pressure profile I have negative values. I want compare the pressure drop with an experimental value. My question is: what value should I use? Thanks |
First of all: If you specify your periodic interface with a pressure drop, then there is no point in comparing the pressure drop obtained in the simulation with experimental data.
You could compare mass flow this way. If you want to compare pressure drop, define a mass flow. Then again, the result of your simulation with a highly non-linear pressure drop (even an increase at the inlet) doesn't look trustworthy. There must be something wrong with your setup. The issue with negative static pressure is just a question of normalization. The pressure derivative (pressure drop) is unaffected by this issue. |
Thanks for the elaborate explanation. I am having problems postprocessing periodic flows, for example how do you get the pressure drop to use in the calculation of the friction factors? Do you use the varying part or the constant part? How do you get these to parts in post processing?
|
Dear Chris DeGroot,
Thank you for your explanation :) |
Quote:
|
Quote:
|
All times are GMT -4. The time now is 07:39. |