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Showing results 1 to 14 of 14 Search took 0.00 seconds. Search: Posts Made By: ghorrocks

Forum: CFX April 18, 2024, 19:15

Replies: 36 CFX varying response to mesh types Views: 546 Posted By ghorrocks The key thing you should check is to load the... The key thing you should check is to load the flow into the CFD-Post so you can see exactly what the flow is doing. If your simulation does not complete and therefore there is no results file then...

Forum: CFX April 17, 2024, 21:42

Replies: 36 CFX varying response to mesh types Views: 546 Posted By ghorrocks Have you had a look at the outlet boundary to see... Have you had a look at the outlet boundary to see why there is backflow? Is it in the boundary layer adjacent to a wall? Or in the bulk flow? Or a vortex convected from upstream? There is nothing...

Forum: CFX April 11, 2024, 06:22

Replies: 36 CFX varying response to mesh types Views: 546 Posted By ghorrocks Your transient simulation uses time steps of 1ms,... Your transient simulation uses time steps of 1ms, but the adaptive time stepping never gets as small as 1ms, it is 1.6 to 2ms. So it looks like you should put a maximum time step of 1ms as that can...

Forum: CFX April 11, 2024, 00:11

Replies: 36 CFX varying response to mesh types Views: 546 Posted By ghorrocks Please upload your output file. Do not use a... Please upload your output file. Do not use a third party site - just put it as an attachment on this forum. Also please post an image of your mesh, with a detail of the near-wall mesh. Also show...

Forum: CFX April 10, 2024, 23:13

Replies: 36 CFX varying response to mesh types Views: 546 Posted By ghorrocks A few points: 1) I am not a professor :) 2)... A few points: 1) I am not a professor :) 2) It was not my suggestion, it was Opaques. I do not know if he is a professor :) 3) The CFX documentation describes the contents of the output file. But...

Forum: CFX April 7, 2024, 18:59

Replies: 36 CFX varying response to mesh types Views: 546 Posted By ghorrocks It would be good if you showed some images of the... It would be good if you showed some images of the recirculation at the outlet. Yes, you can just change a steady state simulation to transient. I would not recommend using Courant number to define...

Forum: CFX April 5, 2024, 23:56

Replies: 36 CFX varying response to mesh types Views: 546 Posted By ghorrocks The "Wall placed at an outlet..." thing is a... The "Wall placed at an outlet..." thing is a warning, not an error. The simulation will proceed despite the statement. If the wall is OK then the simulation is fine and you do not need to do anything...

Forum: CFX March 31, 2024, 00:42

Replies: 36 CFX varying response to mesh types Views: 546 Posted By ghorrocks You could always try coarsening the mesh and see... You could always try coarsening the mesh and see what happens. But if this says you do not have enough computing resources to get the accuracy you want then you have your answer - this model is...

Forum: CFX March 21, 2024, 16:55

Replies: 36 CFX varying response to mesh types Views: 546 Posted By ghorrocks Question 1: Mesh sensitivity: To do a mesh... Question 1: Mesh sensitivity: To do a mesh sensitivity study, do a run of your current mesh and note the output parameters you are interested in. It could be pressure drop, separation location,...

Forum: CFX March 19, 2024, 16:34

Replies: 36 CFX varying response to mesh types Views: 546 Posted By ghorrocks You cannot say in general what you need to do to... You cannot say in general what you need to do to fix initial condition problems. If there was a universal fix, then wouldn't it be implemented in the code already? The exact initial condition...

Forum: CFX March 15, 2024, 01:09

Replies: 36 CFX varying response to mesh types Views: 546 Posted By ghorrocks I presume you have read the CFX Theory manual,... I presume you have read the CFX Theory manual, the section on Multiphase/Solid Particle Collision Models. That is the section of CFX which covers that physics.

Forum: CFX March 14, 2024, 23:32

Replies: 36 CFX varying response to mesh types Views: 546 Posted By ghorrocks There is no problem with CFX modelling full pipes... There is no problem with CFX modelling full pipes with hex meshes. I can say that with some confidence :) There is a some problem with your setup. There are many, many things it could be. You are...

Forum: CFX March 14, 2024, 20:57

Replies: 36 CFX varying response to mesh types Views: 546 Posted By ghorrocks Your total number of nodes is 170k. This is a... Your total number of nodes is 170k. This is a very small mesh so this is more evidence to suggest your mesh is far too coarse. There is no point in trying to infer conclusions from a mesh which is...

Forum: CFX March 14, 2024, 16:24

Replies: 36 CFX varying response to mesh types Views: 546 Posted By ghorrocks This is the CFX forum, you posted your question... This is the CFX forum, you posted your question in the correct place. Another way of looking at it is that if changes like changing the mesh type makes a significant difference to the result then...

Showing results 1 to 14 of 14

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