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Search took 0.00 seconds. Search: Posts Made By: Jade M
Forum: Main CFD Forum July 29, 2010, 11:15
Replies: 40
Views: 26,458
Posted By Jade M
Hi mannobot, Very interesting. In CFX,...

Hi mannobot,

Very interesting. In CFX, there is the option for transition with the SST model. The recommended transition model is the Gamma Theta Model developed by Langtry and Menter, which...
Forum: Main CFD Forum July 26, 2010, 17:32
Replies: 40
Views: 26,458
Posted By Jade M
Advice from ANSYS

mannobot, I also received some very helpful advice from ANSYS Tech Support that I thought might be of interest to you. Please see below.

In regards to determining when flow if fully turbulent...
Forum: Main CFD Forum July 26, 2010, 17:30
Replies: 40
Views: 26,458
Posted By Jade M
Reply to mannobot

It is true that the boundary layer will be laminar starting at the leading edge. As the velocity increases, the Reynolds number will increase. The transition for a flat plate occurs at the position...
Forum: Main CFD Forum July 26, 2010, 17:23
Replies: 40
Views: 26,458
Posted By Jade M
Plotting Turbulent Results

For those who are interested, I recently learned the answer to my question! In Post, click Insert > Location > Vertex Core Regions.
Forum: Main CFD Forum April 23, 2010, 14:44
Replies: 40
Views: 26,458
Posted By Jade M
Hi agd, I have another question for you and...

Hi agd, I have another question for you and everyone. I seem to have consistently heard that SST is a good model. Is there any situation in which it is better to use the k-epsilon or any...
Forum: Main CFD Forum April 23, 2010, 12:03
Replies: 40
Views: 26,458
Posted By Jade M
Hello again, agd and others. I have been...

Hello again, agd and others.

I have been trying to learn about turbulence as fast as I can but my knowledge is still lacking a great deal. Can you briefly describe what the results for eddy...
Forum: Main CFD Forum April 23, 2010, 11:54
Replies: 40
Views: 26,458
Posted By Jade M
Excellent! Thanks so very much, agd. I have...

Excellent! Thanks so very much, agd. I have learned a lot from you in this discussion which I appreciate very much.

I was further thinking. It makes sense that the streamlines are not the best...
Forum: Main CFD Forum April 23, 2010, 09:46
Replies: 40
Views: 26,458
Posted By Jade M
Very interesting. Thanks everyone for your...

Very interesting. Thanks everyone for your thoughtful input. agd, well said. I think you hit the nail on the head. It bothered me the laminar versus turbulent sections. mannobot, good point about...
Forum: Main CFD Forum April 22, 2010, 14:55
Replies: 40
Views: 26,458
Posted By Jade M
Thanks so much agd. Good to know the...

Thanks so much agd.

Good to know the disadvantages of k-epsilon. It does not sound like there are many advantages?

Good point about the relaminarization. I guess that I'm making this...
Forum: Main CFD Forum April 22, 2010, 12:28
Replies: 40
Views: 26,458
Posted By Jade M
Thanks so much agd! I was thinking...

Thanks so much agd!

I was thinking further. I think my question is more fundamental rather than necessarily CFX related although I'm fairly new to turbulence and CFX so I could be wrong. I say...
Forum: Main CFD Forum April 22, 2010, 08:42
Replies: 40
Views: 26,458
Posted By Jade M
Another Question for agd

Hi agd and everyone,

For my problem with the finned section, I ran all the RANS models available in CFX. All results produced by epsilon-based models were way off and all results produced by...
Forum: Main CFD Forum April 22, 2010, 08:35
Replies: 40
Views: 26,458
Posted By Jade M
mannobot, These are good questions. I...

mannobot,

These are good questions. I think DoHander's suggestion is very helpful. For whatever it's worth, I'll chip in a couple of more comments.

If you have the time and computational...
Forum: Main CFD Forum April 21, 2010, 15:58
Replies: 40
Views: 26,458
Posted By Jade M
Question for agd

Very interesting.

I have a slightly different but related question that I think you might be shed some light on. What would you recommend if the flow was laminar in over some of the domain and...
Forum: Main CFD Forum April 21, 2010, 14:30
Replies: 40
Views: 26,458
Posted By Jade M
I wondered the very same thing myself.

I guess the basic answer is that turbulence models can introduce things that are non-physical in the flow if the flow is truly laminar. I was hoping that the "safe" thing to do is run turbulent so...
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