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Showing results 1 to 7 of 7 Search took 0.00 seconds. Search: Posts Made By: ghorrocks

Forum: CFX May 9, 2012, 07:23

Replies: 30 Water turbine model Views: 5,258 Posted By ghorrocks OK, but details are important - is the free... OK, but details are important - is the free surface important? How have you modelled it? Does it have waves on it? Does the water have sediment in it? How smooth are the impellor blade surface...

Forum: CFX May 5, 2012, 07:28

Replies: 30 Water turbine model Views: 5,258 Posted By ghorrocks I do not know the precise physics of what your... I do not know the precise physics of what your experiment or your simulation. So I cannot tell you what you missed - you are the one who has to figure that out as you know what you are modelling best.

Forum: CFX May 4, 2012, 08:19

Replies: 30 Water turbine model Views: 5,258 Posted By ghorrocks How can I know? You know your experimental... How can I know? You know your experimental results and simulation best, it is up to you to find it.

Forum: CFX May 4, 2012, 06:39

Replies: 30 Water turbine model Views: 5,258 Posted By ghorrocks When you are converging on the wrong answer it... When you are converging on the wrong answer it tells you that you have missed an important piece of physics in your simulation. Maybe cavitation? Multiphase flow? Experimental error? Small variations...

Forum: CFX April 26, 2012, 07:40

Replies: 30 Water turbine model Views: 5,258 Posted By ghorrocks It is a bad idea to scale the geometry. There are... It is a bad idea to scale the geometry. There are all sorts of non-dimensional numbers at play in your model - Reynolds, Froude, Nusselt and many more depending on what models you are using. You can...

Forum: CFX April 24, 2012, 01:45

Replies: 30 Water turbine model Views: 5,258 Posted By ghorrocks The CFX tutorials show how to acitvate various... The CFX tutorials show how to acitvate various models. They do not show you how to perform a good CFD analysis. Have you read the FAQ on this:...

Forum: CFX April 23, 2012, 00:59

Replies: 30 Water turbine model Views: 5,258 Posted By ghorrocks Free slip walls and no turbulence model is NOT an... Free slip walls and no turbulence model is NOT an inviscid solution. It is a viscous solution with free slip walls and a possible unphysical instability due to insufficient dissipation due to the...

Showing results 1 to 7 of 7

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