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Forum: CFX

August 5, 2016, 03:10

Replies: 20

using RNG k-e

Views: 1,841

Posted By zryan civil

I tested three time step (0.05, 0.04, 0.03), the...

I tested three time step (0.05, 0.04, 0.03), the results of (0.03, 0.04) is near to each other and courant No. reduced to 10 at time step 0.03. is that enough?

Forum: CFX

August 4, 2016, 07:14

Replies: 20

using RNG k-e

Views: 1,841

Posted By zryan civil

according to residuals and imbalances the results...

according to residuals and imbalances the results appear that reached convergence, but Courant No. is high (RMS Courant no. = 15 , MAX Courant no. = 286) is the a problem?

Forum: CFX

July 28, 2016, 15:46

Replies: 20

using RNG k-e

Views: 1,841

Posted By zryan civil

ok, I defined residual (10-4), and imbalances...

ok, I defined residual (10-4), and imbalances 0.01, and a monitor point at outlet to monitor mass flow rate (or any interest variable), if the a above criterion are met, so the convergence was...

Forum: CFX

July 28, 2016, 04:36

Replies: 20

using RNG k-e

Views: 1,841

Posted By zryan civil

thanks If I used time step according to...

thanks
If I used time step according to equation, how can I check my result does reach convergence

Forum: CFX

July 24, 2016, 13:32

Replies: 20

using RNG k-e

Views: 1,841

Posted By zryan civil

I did sensitivity analysis for choosing mesh...

I did sensitivity analysis for choosing mesh size, turbulent model, for this reason I used k-e and RNGk-e and compare their result, the third is the comparison between steady and transient simulation...

Forum: CFX

July 23, 2016, 10:25

Replies: 20

using RNG k-e

Views: 1,841

Posted By zryan civil

After changing mesh to coarse to hide vortex...

After changing mesh to coarse to hide vortex shedding in order to become convergence and increasing time scale the results are, mass flow rate become constant, but highly fluctuation observed in...

Forum: CFX

July 22, 2016, 15:13

Replies: 20

using RNG k-e

Views: 1,841

Posted By zryan civil

as I understood from your post , (if changing...

as I understood from your post , (if changing turbulence model from RNG k-e to standard k-e, makes the solver numericaly unstable then some parameters should be changed such as (time scale, mesh...

Forum: CFX

July 22, 2016, 07:28

Replies: 20

using RNG k-e

Views: 1,841

Posted By zryan civil

but I did all above parameters for simulation by...

but I did all above parameters for simulation by k-e and successfully reach convergence but for RNG k-e does not reach

Forum: CFX

July 22, 2016, 06:34

Replies: 20

using RNG k-e

Views: 1,841

Posted By zryan civil

but I do not change anything in my model, only...

but I do not change anything in my model, only turbulence model from k-e to RNG k-e, what should I do to the model in order become convergence with RNG K-e??? I reduced time scale but It does not...

Forum: CFX

July 22, 2016, 01:48

Replies: 20

using RNG k-e

Views: 1,841

Posted By zryan civil

have anyone any suggestion for above problem...

have anyone any suggestion for above problem ??????, please

Forum: CFX

July 21, 2016, 03:55

Replies: 20

using RNG k-e

Views: 1,841

Posted By zryan civil

using RNG k-e

I used k-e for free surface model the result was converged, but for the same model (same mesh size time scale .... ) I used RNG k-e (for comparison)the simulation does not reach to convergence after...

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