|November 8, 2013, 14:55||
Weird oscillations in simulation of 3D laminar flow in a square duct
Join Date: Nov 2013
Posts: 2Rep Power: 0
I'm doing for my investigation proyect the simulation of 3D laminar flow in a square duct (Lx = Lz = 5 (cm), Ly = 50 (cm)).
The problem that we are experiencing is that the z-velocity component (transversal to the flow) grows unrealisticaly, provocating global divergence after a few iterations (see attached figure).
We are using the compresible unsteady SIMPLE algorithm with power law scheme, fluid used is air and inlet velocity (y=0) is 2.5 (m/s).
After one month we have failed to encounter a solution to this problem, can you give me an idea please??
Thanks in advance!!
|November 8, 2013, 15:13||
Filippo Maria Denaro
Join Date: Jul 2010
Posts: 1,999Rep Power: 26
1) the Re number is O(10^3) for the reference lenght (Lx,Lz) but increases along the axis, are you sure that for a full confined duct your field produces a steady laminar solution?
2) you compressible solver can produce stable and oscillation-free solutions for low Mach flows?
|Thread||Thread Starter||Forum||Replies||Last Post|
|CFX Treatment of Laminar and Turbulent Flows||Jade M||CFX||10||December 11, 2015 20:52|
|Laminar flow simulation in rotating domain||rahulv||CFX||7||July 9, 2014 06:19|
|Comparison between Solidworks Flow Simulation and Ansys Fluent||Bruce828||Main CFD Forum||5||February 23, 2013 11:13|
|Sample simulation of axial flow impeller in a duct||Vashishth||CFX||1||November 16, 2008 20:34|
|help! flow in square duct||chris||Main CFD Forum||2||December 22, 2003 11:13|