Unsteady Flow Modeling in Flow3D

flow3d_399 · July 31, 2009, 02:11

Folks,

Can we do Unsteady Flow Modeling in Flow3D? If yes, how ?

Any idea or comment?

Thanks

FM

ck5285 · July 31, 2009, 03:48

I believe you are referring to transient fluid flow modeling right? flow-3d is design to solve transient flow + VOF. btw, is your problem is free surface flow or confined flow?

flow3d_399 · July 31, 2009, 04:21

Well, i am trying to model unsteady flow in a pressure tunnel. How can i enter the unsteady flow data as input to the model?

mghoma · August 2, 2009, 17:21

Hello

I want to model 2D open channel flow using wall jet in the inlet and I want to see the depression close to the jet so i am convulsed about the boundary condition so i start with velocity inlet using VOF and outflow in the top and the outlet but I do not get good result than I use pressure inlet using open channel with free surface and velocity inlet about (1m/s) and pressure outlet top and the outlet and I still I am not able to see good free surface and depression close to the jet as what I have got from the experimental data so please if anyone know how to solve this problem please send me email (mghoma@yahoo.com) .Thanks for all your help.

Regards
Ghoma

flow3d_399 · August 7, 2009, 01:14

Quote:

Originally Posted by ck5285

I believe you are referring to transient fluid flow modeling right? flow-3d is design to solve transient flow + VOF. btw, is your problem is free surface flow or confined flow?

Can you plz explain how one can do the tansient flow modeling in flow3d? Which model in Flow3d should be used?

thanks in advance.

Flow

ck5285 · August 9, 2009, 22:39

Hi
by default all simulation in Flow-3D is transient/unsteady flow as Flow-3D doesn't really have a steady state solver.
so if you are model confined flow without free surface then you just need to turn on -> No sharp interface -> One Fluid
if you are dealing with free surface then turn on free surface under interface tracking.

for BC, you can have pressure inlet, velocity inlet as function of time to simulate unsteady input.

hope this help

MuxaB · August 13, 2009, 23:34

Quote:

Originally Posted by flow3d_399

Well, i am trying to model unsteady flow in a pressure tunnel. How can i enter the unsteady flow data as input to the model?

Is it confined or has a free surface? What makes it transient?

July 31, 2009, 02:11	Unsteady Flow Modeling in Flow3D	#1
flow3d_399 New Member Flow Join Date: Jul 2009 Posts: 3 Rep Power: 17	Folks, Can we do Unsteady Flow Modeling in Flow3D? If yes, how ? Any idea or comment? Thanks FM

August 2, 2009, 17:21	Free surface in open channel flow	#4
mghoma New Member Mohamed Ghoma Join Date: May 2009 Posts: 1 Rep Power: 0	Hello I want to model 2D open channel flow using wall jet in the inlet and I want to see the depression close to the jet so i am convulsed about the boundary condition so i start with velocity inlet using VOF and outflow in the top and the outlet but I do not get good result than I use pressure inlet using open channel with free surface and velocity inlet about (1m/s) and pressure outlet top and the outlet and I still I am not able to see good free surface and depression close to the jet as what I have got from the experimental data so please if anyone know how to solve this problem please send me email (mghoma@yahoo.com) .Thanks for all your help. Regards Ghoma

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July 31, 2009, 03:48		#2
ck5285 Senior Member Join Date: Mar 2009 Posts: 129 Rep Power: 17	I believe you are referring to transient fluid flow modeling right? flow-3d is design to solve transient flow + VOF. btw, is your problem is free surface flow or confined flow?

July 31, 2009, 04:21		#3
flow3d_399 New Member Flow Join Date: Jul 2009 Posts: 3 Rep Power: 17	Well, i am trying to model unsteady flow in a pressure tunnel. How can i enter the unsteady flow data as input to the model?

August 9, 2009, 22:39		#6
ck5285 Senior Member Join Date: Mar 2009 Posts: 129 Rep Power: 17	Hi by default all simulation in Flow-3D is transient/unsteady flow as Flow-3D doesn't really have a steady state solver. so if you are model confined flow without free surface then you just need to turn on -> No sharp interface -> One Fluid if you are dealing with free surface then turn on free surface under interface tracking. for BC, you can have pressure inlet, velocity inlet as function of time to simulate unsteady input. hope this help