ANSYS -- CFD Online Discussion Forums
ANSYS - Topics related to the software ... Discussions about ANSYS Meshing, DesignModeler, ICEM CFD, TGrid ...
Single v.s. double precision -- CFD Online Discussion Forums
2004年4月7日 · Hi, Double precision will be significant if tiny relative differences are significant. Examples where you would expect double precision to make a difference are natural convection (especially if modelled with the fully compressible option); meshes with a large difference between the largest and smallest element sizes; large geometries with small but significant features; …
K-epsilon models -- CFD-Wiki, the free CFD reference - CFD Online
Introduction . The K-epsilon model is one of the most common turbulence models, although it just doesn't perform well in cases of large adverse pressure gradients (Reference 4).
CFD Online - Y-Plus Wall Distance Estimation
The formulas used are give in CFD-Wiki here.The Schlichting skin-friction formula, as desribed here (equation 21.16 footnote in Schlichting), is used to estimate the local skin-friction for a turbulent boundary layer on a smooth flat plate.
Oscillations in Results and Residuals - CFD Online
2006年1月14日 · Yes, I think so too. When my solution starts to oscillate, all residuals are below 1e-4 (also the continuity residual, that is between 1e-4 and 2e-4) , so I think I get an acceptable solution.
How to extract Lift and Drag coefficients from Ansys Fluent
Hi, I am also doing a project for my final year university using ANSYS Fluent/ CFD to analyse aerodynamically Drag and Lift on a vehicle. i have already done my mesh and solution fully converged. i am trying to find out if there is anyway to plot the drag around the different parts of …
Turbulence intensity -- CFD-Wiki, the free CFD reference - CFD …
Russo and Basse published a paper [3] where they derive turbulence intensity scaling laws based on CFD simulations and Princeton Superpipe measurements. The turbulence intensity over the pipe area is defined as an arithmetic mean (AM).
General recommendations for CFD hardware [WIP] - CFD Online
2021年2月22日 · General purpose CFD software like Ansys Fluent requires in the range of 1-4 GB of RAM per million cells. SIMPLE solver in single precision marks the lower end of that range, coupled solver in double precision sits at the higher end. This should give you a rough idea how much memory is enough. There are always exceptions of course.
static vs. total pressure -- CFD Online Discussion Forums
2016年2月26日 · What Fluent and CFD codes call Static pressure is actually a vulgar way to refer to the Thermodynamic pressure calculated from the Navier Stokes equations. As you understand it, Static pressure, has nothing to do with fluid dynamics.
Residuals of continuity not converging - CFD Online
2015年9月12日 · Hello , I'm modeling a flow through a 2-D channel with a rectangular bluff-body of Channel Diameter = 25 mm Bluff body Diameter = 5 mm Velocity inlet