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

Forum: CFX November 12, 2017, 17:38

Replies: 25 Question about adaptive timestepping Views: 2,785 Posted By ghorrocks The explanation is the same as all along - the... The explanation is the same as all along - the solver is having trouble converging so it requires a very small time step to converge. From here I would recommend: * Look at the results files in...

Forum: CFX November 9, 2017, 22:35

Replies: 25 Question about adaptive timestepping Views: 2,785 Posted By ghorrocks Based on your comments I recommend: *... Based on your comments I recommend: * Changing to Thermal energy model. You don't need a full total energy model. Also turn viscous heating off. This will simplify your physics. * If you think...

Forum: CFX November 9, 2017, 21:16

Replies: 25 Question about adaptive timestepping Views: 2,785 Posted By ghorrocks I see lots of issues. * You have viscous work... I see lots of issues. * You have viscous work on. Unless you intend to model viscous heating turn it off. I can't see how viscous heating is significant here. * Why are you modelling the solid?...

Forum: CFX November 9, 2017, 16:08

Replies: 25 Question about adaptive timestepping Views: 2,785 Posted By ghorrocks The CCL should be just a small text file. Posting... The CCL should be just a small text file. Posting it as an attachment is preferred, but copy/paste into the forum text is OK as well.

Forum: CFX November 9, 2017, 00:50

Replies: 25 Question about adaptive timestepping Views: 2,785 Posted By ghorrocks The tiny time step is the solution, not the... The tiny time step is the solution, not the problem. You have to find a way of making the run time manageable despite the small time step. This is why ANSYS has done years of work to get CFX a...

Forum: CFX November 8, 2017, 17:39

Replies: 25 Question about adaptive timestepping Views: 2,785 Posted By ghorrocks Different simulations have different mesh quality... Different simulations have different mesh quality requirements. A incompressible low Reynolds number simulation is tolerant of very poor mesh. Surface tension and shock waves are two examples of...

Forum: CFX November 6, 2017, 21:17

Replies: 25 Question about adaptive timestepping Views: 2,785 Posted By ghorrocks Mesh quality is things like aspect ratio,... Mesh quality is things like aspect ratio, orthogonality, expansion ratio. Mesh size is... well, just mesh size. The size can be different in different directions (eg inflation layers have...

Forum: CFX November 6, 2017, 19:40

Replies: 25 Question about adaptive timestepping Views: 2,785 Posted By ghorrocks Mesh quality and mesh size are not... Mesh quality and mesh size are not interchangeable. They are different things and have very different effects. If you refine an area of poor quality mesh you are likely to just get small poor...

Forum: CFX November 6, 2017, 01:12

Replies: 25 Question about adaptive timestepping Views: 2,785 Posted By ghorrocks If you use a time step far larger than... If you use a time step far larger than recommended then either it will not converge or your results are likely to be rubbish. If you could use a far larger time step than it recommends then why would...

Showing results 1 to 9 of 9

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