|February 28, 2014, 05:37||
Transient solution, variable does not change with time
Join Date: Feb 2014
Posts: 1Rep Power: 0
I am attempting to determine the frequency of vortex shedding of a nozzle. The fluid is water. I have set up a steady state solver to provide the initial conditions for a transient solution. The solvers run concurrently and were set up following these instructions.
Both the steady state and transient cases are run using Shear Stress Transport as a turbulence model.
I set the time interval to give me a courant number of 5 and ran the transient case for 500 time steps. In the results window I inserted a point just downstream of the nozzle and created a chart of pressure against time. Apart from an initial fluctuation, pressure settles to a value and remains unchanged. I get the same result if I plot total pressure. The steady state solution shows eddy viscosity to be in the order of 0.38Pa S downstream of the nozzle, so I am minded to think that there would be some pressure fluctuation. Can anyone advise me as to what I might be doing wrong?
|February 28, 2014, 15:57||
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 12,395Rep Power: 96
The basics are covered in an FAQ: http://www.cfd-online.com/Wiki/Ansys..._inaccurate.3F
|strouhal number, transient analysis, vortex shedding|
|Thread||Thread Starter||Forum||Replies||Last Post|
|Unstabil Simulation with chtMultiRegionFoam||mbay101||OpenFOAM Running, Solving & CFD||13||December 28, 2013 14:12|
|AMI speed performance||danny123||OpenFOAM||19||October 24, 2012 07:44|
|Time accurate vs Fast Transient Solution||pritam.edke||CD-adapco||0||June 18, 2012 14:57|
|Creating Table of Variable versus Time in Transient simulation in CFX 11||cjhaw||CFX||2||January 15, 2011 12:52|
|Replace periodic by inlet-outlet pair||lego||CFX||3||November 5, 2002 21:09|