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Showing results 1 to 8 of 8 Search took 0.00 seconds. Search: Posts Made By: ghorrocks

Forum: CFX July 23, 2018, 03:04

Replies: 21 Problem in Torque calculation Views: 5,325 Posted By ghorrocks As you are using Fluent, not CFX I can only give... As you are using Fluent, not CFX I can only give general advice. First of all the general FAQ I previously quoted on accuracy is important. I would not have quoted it otherwise. If you have not...

Forum: CFX July 6, 2018, 03:43

Replies: 21 Problem in Torque calculation Views: 5,325 Posted By ghorrocks It is not possible to diagnose the problem... It is not possible to diagnose the problem without a detailed look at your setup. In the meantime, have you read the general FAQ on accuracy:...

Forum: CFX October 9, 2015, 07:37

Replies: 21 Problem in Torque calculation Views: 5,325 Posted By ghorrocks At the big angles of attack this thing runs at... At the big angles of attack this thing runs at any turbulence model should be OK. So your comment that turbulence model choice makes a big difference seems strange to me. That is what I would expect...

Forum: CFX October 9, 2015, 05:04

Replies: 21 Problem in Torque calculation Views: 5,325 Posted By ghorrocks Well, let me put it another way: The CFD results... Well, let me put it another way: The CFD results do not match your expectations. So is the CFD wrong or your expectations? I cannot count the times my expectations have been wrong in scenarios like...

Forum: CFX October 7, 2015, 23:31

Replies: 21 Problem in Torque calculation Views: 5,325 Posted By ghorrocks Why do you expect a decrease of torque after the... Why do you expect a decrease of torque after the stall point? And a second question, is the graph you showed at a fixed rpm? Dynamic pressure = 0.5*rho*v^2, so as the velocity increases the...

Forum: CFX October 7, 2015, 18:59

Replies: 21 Problem in Torque calculation Views: 5,325 Posted By ghorrocks Can you show the torque versus flow rate curve... Can you show the torque versus flow rate curve you are getting, and what you expect it to be?

Forum: CFX October 6, 2015, 18:58

Replies: 21 Problem in Torque calculation Views: 5,325 Posted By ghorrocks What is the mass flow force? Torque integrates... What is the mass flow force? Torque integrates the wall shear and pressure over the surface. No other forces act on the body. Just because it has stalled does not mean you will get no torque. It...

Forum: CFX October 5, 2015, 17:44

Replies: 21 Problem in Torque calculation Views: 5,325 Posted By ghorrocks Have you looked at the flow field to see why the... Have you looked at the flow field to see why the torque is still increasing? Obviously CFX is missing something it the torque is meant to drop off. SST has not restriction on high speeds. It works...

Showing results 1 to 8 of 8

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