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Showing results 1 to 11 of 11 Search took 0.00 seconds. Search: Posts Made By: RodriguezFatz

Forum: FLUENT July 20, 2012, 01:44

Replies: 36 Gas Cyclone convergence problem Views: 4,892 Posted By RodriguezFatz Plainly, this one: ... Plainly, this one: http://www.cfd-online.com/Books/show_book.php?book_id=4&full_review=1 It is one of three really, really good cfd books I can recommend. And it has everything you need about...

Forum: FLUENT July 19, 2012, 06:40

Replies: 36 Gas Cyclone convergence problem Views: 4,892 Posted By RodriguezFatz I'm not simulating a cyclone at all. I just use... I'm not simulating a cyclone at all. I just use the DPM model. Different numerical schemes use different approximations for the derivatives. Thus, they replace a derivative with the differential...

Forum: FLUENT July 19, 2012, 02:47

Replies: 36 Gas Cyclone convergence problem Views: 4,892 Posted By RodriguezFatz Again, if you have numerical problems: Go to the... Again, if you have numerical problems: Go to the safest level of all approximations, i.e. 1st oder upwind spatial and purely implicit time schemes. If this doens't work you can think about other...

Forum: FLUENT July 18, 2012, 08:04

Replies: 36 Gas Cyclone convergence problem Views: 4,892 Posted By RodriguezFatz That sounds exactly like my problem. Try 1st... That sounds exactly like my problem. Try 1st order upwind.

Forum: FLUENT July 18, 2012, 02:48

Replies: 36 Gas Cyclone convergence problem Views: 4,892 Posted By RodriguezFatz During each timestep, do the residuals stop... During each timestep, do the residuals stop getting better after some iteration and remain at, let's say 1.0e-2 ? How large is you maximum number of iterations per timestep?

Forum: FLUENT July 17, 2012, 09:39

Replies: 36 Gas Cyclone convergence problem Views: 4,892 Posted By RodriguezFatz One other thing: Reduce the order of your... One other thing: Reduce the order of your continuous phase numerics towards more dissipative schemes ("as much 1st order upwind as possible"). That did the trick for me right now!

Forum: FLUENT July 17, 2012, 05:05

Replies: 36 Gas Cyclone convergence problem Views: 4,892 Posted By RodriguezFatz If my quick calculation was correctly, your input... If my quick calculation was correctly, your input should be fine. I have a volume fraction of 1.38e-5 for your case, which is by far low enough! Try a run with the new settings, it should work...

Forum: FLUENT July 17, 2012, 04:50

Replies: 36 Gas Cyclone convergence problem Views: 4,892 Posted By RodriguezFatz 1) What's the density of your particle material?... 1) What's the density of your particle material? How large is the inlet area? 2) Try to uncheck "Automated". Then choose just "implicit". You have to get rid of your numerical problems first, then...

Forum: FLUENT July 17, 2012, 04:22

Replies: 36 Gas Cyclone convergence problem Views: 4,892 Posted By RodriguezFatz Try "1". Are you sure? In my case... Try "1". Are you sure? In my case "trapezoidal" was set as default. The rest sounds fine. Did you calculate your particle mass flow correctly?

Forum: FLUENT July 17, 2012, 03:49

Replies: 36 Gas Cyclone convergence problem Views: 4,892 Posted By RodriguezFatz Ok, then try "Update DPM Sources Every Flow... Ok, then try "Update DPM Sources Every Flow Iteration", thats the checkbox below. You can also set "Number of Continuous Phase Iterations per DPM Iteration" to 1. And, also in the "Discrete Phase...

Forum: FLUENT July 17, 2012, 03:17

Replies: 36 Gas Cyclone convergence problem Views: 4,892 Posted By RodriguezFatz 1) Do you consecutively inject particles at your... 1) Do you consecutively inject particles at your inlet? 2) Do you have "Interaction with Continuous Phase" switched on?

Showing results 1 to 11 of 11

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