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Showing results 1 to 13 of 13 Search took 0.00 seconds. Search: Posts Made By: cfdhydraulic

Forum: FLUENT March 29, 2012, 14:50

Replies: 22 convergence unsteady state Views: 3,024 Posted By cfdhydraulic mesh is ok because I have a 97% of element... mesh is ok because I have a 97% of element quality, low skewness, and fine aspect ratio. A finest mesh will make me require a parallel process... have you ever tried to solve a discharging process?...

Forum: FLUENT March 24, 2012, 10:38

Replies: 22 convergence unsteady state Views: 3,024 Posted By cfdhydraulic check results... Hi Banty, look at this... 87 seconds and the tanks still full with air and pressurized... no way... I started with time step 0.1 then 0.5... then 1 then 5... nothing... results are pretty much...

Forum: FLUENT March 24, 2012, 07:55

Replies: 22 convergence unsteady state Views: 3,024 Posted By cfdhydraulic why 100 or 500? is it 100 or 500 iterations with... why 100 or 500? is it 100 or 500 iterations with 0.6 time step or 0.12 time step? this is it? 60/100 = 06 60/500 = 0.12 but why this number ? I am going to perform the calculations and let ...

Forum: FLUENT March 23, 2012, 13:25

Replies: 22 convergence unsteady state Views: 3,024 Posted By cfdhydraulic by the way what is "large" time steps or "small"... by the way what is "large" time steps or "small" time steps.... large = 1 second? 5 seconds? 30 seconds??? small = 0.001? 0.00001?

Forum: FLUENT March 23, 2012, 13:22

Replies: 22 convergence unsteady state Views: 3,024 Posted By cfdhydraulic actually I would liket to know how long is the... actually I would liket to know how long is the discharging time. How long does the tank take to discharge form 300bar to 75 bar but my experience tell me that it will take less than a minute, but...

Forum: FLUENT March 22, 2012, 16:42

Replies: 22 convergence unsteady state Views: 3,024 Posted By cfdhydraulic here is the problem Hi! this is the problem... I need to perform unsteady state study to get info about how a system behaves during 60 seconds. If I use a time step of 0.00001 it converges perfect and the results...

Forum: FLUENT March 22, 2012, 16:04

Replies: 22 convergence unsteady state Views: 3,024 Posted By cfdhydraulic I am using implicit, as you said, it is default.... I am using implicit, as you said, it is default. But time seems to matter...I am going to try with a coarser mesh by changing advanced control parameters "max coarser" I will let you know please...

Forum: FLUENT March 22, 2012, 00:44

Replies: 22 convergence unsteady state Views: 3,024 Posted By cfdhydraulic mmm.... where is this option located in the... mmm.... where is this option located in the interface program? i am going to google it :) I appreciate your help, thanks

Forum: FLUENT March 22, 2012, 00:39

Replies: 22 convergence unsteady state Views: 3,024 Posted By cfdhydraulic But NITA is only operative in pressure-based... But NITA is only operative in pressure-based cases and I am using density-based... on the other hand, my experience says that the tank that I am simulating will discharge in about 5 minutes but...

Forum: FLUENT March 21, 2012, 20:46

Replies: 22 convergence unsteady state Views: 3,024 Posted By cfdhydraulic I need to simulate what's happening in my process... I need to simulate what's happening in my process after 5 minutes. The time step is 0.0001 to small because I have a good mesh. Good mesh, smaller cells, so small time step. "It all depends on...

Forum: FLUENT March 21, 2012, 20:31

Replies: 22 convergence unsteady state Views: 3,024 Posted By cfdhydraulic thanks you all! another question though... ... thanks you all! another question though... if my time step must to be 0.00001 to achieve convergence, I have to iterate 10000 to simulate 1 second!!! and it takes hours!! like... forever! ...

Forum: FLUENT March 20, 2012, 19:03

Replies: 22 convergence unsteady state Views: 3,024 Posted By cfdhydraulic convergence/divergence unsteady state I post a picture so you can figure it out Thanks in advance Hi everyone! I am studying a transient state study (unsteady). The first iteration is correct and it achieves a perfect convergence...

Forum: FLUENT March 20, 2012, 19:01

Replies: 22 convergence unsteady state Views: 3,024 Posted By cfdhydraulic convergence unsteady state Hi everyone! I am studying a transient state study (unsteady). The first iteration is correct and it achieves a perfect convergence but, the second one... it doesn't converge at all it's that a...

Showing results 1 to 13 of 13

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