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Showing results 1 to 14 of 14 Search took 0.00 seconds. Search: Posts Made By: Julian121

Forum: CFX February 7, 2019, 14:11

Replies: 29 Convergence problem Views: 3,239 Posted By Julian121 Yes, it is moving as the rotor rotates. I loaded... Yes, it is moving as the rotor rotates. I loaded the results at different time steps and the non-overlap area do exist. Does this area affect the results? This area is beneath of the vanes and...

Forum: CFX February 7, 2019, 08:09

Replies: 29 Convergence problem Views: 3,239 Posted By Julian121 It seems that the area under the vanes are in the... It seems that the area under the vanes are in the non-overlap portion of the Rotor/CT interface. The vanes have been removed from the CT domain. Should I change the rotor domain? Do you...

Forum: CFX February 6, 2019, 07:17

Replies: 29 Convergence problem Views: 3,239 Posted By Julian121 Following the difficulty I had faced to obtain... Following the difficulty I had faced to obtain convergence in the steady simulations, I decided to run transient simulations to see if the convergence improves. However, when I was doing the...

Forum: CFX January 19, 2019, 02:24

Replies: 29 Convergence problem Views: 3,239 Posted By Julian121 Following the previous simulations, I run some... Following the previous simulations, I run some new simulations with updated mesh. The operating point is close to the last measured data (stall point) in experimental results. I have...

Forum: CFX January 15, 2019, 09:34

Replies: 29 Convergence problem Views: 3,239 Posted By Julian121 I have followed the instructions about using... I have followed the instructions about using large time scale and coarse mesh in the region where instability exists, but nothing changed. The important parameters such as mass flow or pressure ratio...

Forum: CFX January 11, 2019, 06:14

Replies: 29 Convergence problem Views: 3,239 Posted By Julian121 As the problem I am solving has several domains,... As the problem I am solving has several domains, should the residence time be taken as the maximum value of time over all domains? According to the photo, should I use 0.130902 [s] as physical...

Forum: CFX January 11, 2019, 02:47

Replies: 29 Convergence problem Views: 3,239 Posted By Julian121 I have been working on this for a while since my... I have been working on this for a while since my supervisor insisted that getting RMS residuals down to 1e-6 is necessary even close to the stall point. I followed the steps to identify the...

Forum: CFX November 14, 2018, 11:00

Replies: 29 Convergence problem Views: 3,239 Posted By Julian121 The Locations of high residuals are concentrated... The Locations of high residuals are concentrated toward the wall boundaries inside the casing treatment. Yes, that’s right. The locations of high residuals are small but every time I change...

Forum: CFX November 13, 2018, 08:21

Replies: 29 Convergence problem Views: 3,239 Posted By Julian121 I have run a new set of simulations but still no... I have run a new set of simulations but still no convergence has been possible for three mass flow. I was looking at the residuals of mass for my domains and I noticed that the mass residuals of...

Forum: CFX October 30, 2018, 11:08

Replies: 29 Convergence problem Views: 3,239 Posted By Julian121 I ran a new simulation with a slight change to... I ran a new simulation with a slight change to the geometry of the casing treatment. Even SST with reattachment model did not help this time. So, as you said I tried to find the locations of maximum...

Forum: CFX October 29, 2018, 08:44

Replies: 29 Convergence problem Views: 3,239 Posted By Julian121 Glenn, I would never ignore your comments. I... Glenn, I would never ignore your comments. I always read your comments with great attention. The reason why I was asking again, was that after following FAQ I was not able to obtain convergence. ...

Forum: CFX October 27, 2018, 09:00

Replies: 29 Convergence problem Views: 3,239 Posted By Julian121 The outlet pressure changed a bit but still no... The outlet pressure changed a bit but still no convergence was obtained. The locations of maximum residuals changed this time. I have defined the casing treatment domain as stationary. Is it...

Forum: CFX October 26, 2018, 09:16

Replies: 29 Convergence problem Views: 3,239 Posted By Julian121 I am using physical timestep of 1/omega which is... I am using physical timestep of 1/omega which is 0.003183 for my case. I have no difficulty in obtainging converged solution near to the design point.

Forum: CFX October 26, 2018, 07:09

Replies: 29 Convergence problem Views: 3,239 Posted By Julian121 Convergence problem I have created isovolumes of the maximum momentum residuals in cfd post. The red color corresponds to the maximum momentum residuals. The blue color shows the location of elements with face angle...

Showing results 1 to 14 of 14

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