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Showing results 1 to 9 of 9 Search took 0.00 seconds. Search: Posts Made By: ghorrocks

Forum: CFX September 11, 2013, 08:18

Replies: 19 Stirling Motor Views: 2,627 Posted By ghorrocks If you are in doubt then activate buoyancy. In... If you are in doubt then activate buoyancy. In forced convection flows it does not add much (if anything) to simulation time. It only adds to simulation time in low speed simulations - but that is...

Forum: CFX September 11, 2013, 06:11

Replies: 19 Stirling Motor Views: 2,627 Posted By ghorrocks The question to ask is actually - given the flow... The question to ask is actually - given the flow velocities in my model, will buoyancy make a significant difference? If the answer is no (which your last post seems to imply) then you can turn...

Forum: CFX September 9, 2013, 17:49

Replies: 19 Stirling Motor Views: 2,627 Posted By ghorrocks The temperature change is limited to just the... The temperature change is limited to just the boundary layer in the cylinder, so not much has happened yet. You need to run this for more time so the temperature effects convects into the main flow....

Forum: CFX September 9, 2013, 05:53

Replies: 19 Stirling Motor Views: 2,627 Posted By ghorrocks This is showing that for the case you have... This is showing that for the case you have modelled you are reasonably accurate. But this case has no flow so the only thing causing heat transfer is conduction - and conduction does not include the...

Forum: CFX September 5, 2013, 03:28

Replies: 19 Stirling Motor Views: 2,627 Posted By ghorrocks Yes, that is a good plan - Providing the heat... Yes, that is a good plan - Providing the heat transfer is the key parameter in the simulation. Even if that is not the case it is a good start. Don't forget fluid flow along the pipe and in the...

Forum: CFX September 4, 2013, 18:47

Replies: 19 Stirling Motor Views: 2,627 Posted By ghorrocks This is all discussed in the FAQ I posted right... This is all discussed in the FAQ I posted right at the start :) In short: You need to perform a sensitivity analysis on mesh size. Choose a parameter of importance to you (maybe the work...

Forum: CFX September 4, 2013, 06:01

Replies: 19 Stirling Motor Views: 2,627 Posted By ghorrocks Your mesh is too coarse. Your heat transfer will... Your mesh is too coarse. Your heat transfer will be miles off with a mesh that coarse - which is exactly what you have found. If you had gone through the points described in the FAQ you would have...

Forum: CFX September 3, 2013, 19:00

Replies: 19 Stirling Motor Views: 2,627 Posted By ghorrocks What do you mean by "work buoyant model"? ... What do you mean by "work buoyant model"? Can you post an image of your geometry, your mesh and the flows you are getting (particularly if you think some part of the flow looks wrong).

Forum: CFX September 2, 2013, 18:27

Replies: 19 Stirling Motor Views: 2,627 Posted By ghorrocks Please post an image of what you are simulating. ... Please post an image of what you are simulating. Why do you have gravity enabled? What does it do? This sounds like an FAQ:...

Showing results 1 to 9 of 9

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