Mass Flow Inlet and

wilhelms · November 15, 2011, 08:42

I am going to model an open channel flow with water and air in a 3D model in Fluent. Can anybody recommmend some tutorials for this?

The inlet area is 1.25 m^2 (1.25m x 1m) and I want it to be half filled with water. The model was initialized with air and then patched half full with water. Mass flow inlet was chosen with a flow rate for water 62.5kg/s (A*rho*v = 0.625*1000*0.1) and for air 0.77 (0.625*1.225*0.1). The outlet boundary was set to outflow with a flow rate weight of 1.

The results show a wave like motion where the water level is higher at the outlet boundary than at the inlet. Why could this be? Any comments on the setup of boundary conditions? Or could it be another explanation?

raj.cfd · November 16, 2011, 20:04

use VOF multiphase model, its good for free surface flows. You do have Tutorials, download from ansys website.

November 15, 2011, 08:42	Mass Flow Inlet and	#1
wilhelms New Member Student_87 Join Date: Nov 2011 Posts: 6 Rep Power: 15	I am going to model an open channel flow with water and air in a 3D model in Fluent. Can anybody recommmend some tutorials for this? The inlet area is 1.25 m^2 (1.25m x 1m) and I want it to be half filled with water. The model was initialized with air and then patched half full with water. Mass flow inlet was chosen with a flow rate for water 62.5kg/s (Arhov = 0.62510000.1) and for air 0.77 (0.6251.2250.1). The outlet boundary was set to outflow with a flow rate weight of 1. The results show a wave like motion where the water level is higher at the outlet boundary than at the inlet. Why could this be? Any comments on the setup of boundary conditions? Or could it be another explanation?

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
velocity calculations in mass flow inlet boundary condition	montazer1012	FLUENT	1	October 18, 2010 04:11
particle, parcel and mass flow rate balance	flybird	FLUENT	0	May 24, 2007 11:44
2 Inlet Pres BC's and Out Mass Flow - Convergence	SN	Siemens	0	July 19, 2006 10:12
Mass Flow Inlet	Pravir Kumar Rai	FLUENT	0	February 19, 2003 15:03
mass flow inlet	Denis Tschumperle	FLUENT	7	August 9, 2000 03:19

November 16, 2011, 20:04		#2
raj.cfd New Member raj Join Date: Nov 2011 Posts: 22 Rep Power: 15	use VOF multiphase model, its good for free surface flows. You do have Tutorials, download from ansys website.