0
Negative Initial temperature error in openfoam

I am getting Negative initial temperature error while simulating a flow through a pipe using wedge geometry. How to avoid this error?


OpenFOAM 16-09-21, 12:42 p.m. chaitu208
0
Hi,

Could you give more details regarding the initial & boundary conditions for temperature?

Regards,
Ashley
16-09-21, 12:56 p.m. ashleymelvin

Inlet temperature is 283K and constant wall temperature of 363 K.using buoyantSimpleFoam solver. Working fluid is water.


16-09-21, 1:01 p.m. chaitu208

Thanks for the details. Could you share your case files via a cloud drive and post that link here?

Regards,
Ashley


16-09-21, 1:04 p.m. ashleymelvin

The drive link is attached here.

 

https://drive.google.com/drive/folders/1Uia-sXTbzTVMmpws_959a6kI0P6u4WxW?usp=sharing


16-09-21, 2:20 p.m. chaitu208

Changing the relaxationFactor for the h equation to 0.3 in the fvSolution file seems to get the simulation to run. Please check if the simulation results are what you would expect them to be after the above change.

Regards,
Ashley 


16-09-21, 3:34 p.m. ashleymelvin

Thank you for your help. The simulation is running successfully.

I am new to cfd and openfoam. Can you explain or provide resources about the significance of residuals?

For another simulation, the residuals are converging beyond 10^-6, but after that residuals are osicallting at period intervals. So, can I consider that as a good result?


16-09-21, 3:47 p.m. chaitu208

The link below should help you understand residuals better. 

https://cfd.direct/openfoam/user-guide/v8-fvsolution/

Oscillating residuals usually signify psuedo steady-state. In some cases, this would also mean that the simulation would never converge to a steady-state such as in case of flow over cylinders at high Reynolds number causing the formation of Von Karman vortex streets. A transient analysis would better suit such problems.

Regards,
Ashley


16-09-21, 3:57 p.m. ashleymelvin

Login to add comment


0

I found the other one after posting this but thanks for the helpful instruction. Hopefully it didn't confuse you too much. They should write instructions on how to handle two questions on the same topic. First Call Online

Oops! Looks like spam! Waiting for moderator approval.
23-09-21, 5:34 p.m. Hermiston

Login to add comment
Oops! Looks like spam! Waiting for moderator approval


0
We have sell some products of different custom boxes.it is very useful and very low price please visits this site thanks and please share this post with your friends. medical face mask
Oops! Looks like spam! Waiting for moderator approval.
27-09-21, 2:24 p.m. BrianaBalducci

Login to add comment
Oops! Looks like spam! Waiting for moderator approval


0
Excellent and very exciting site. Love to watch. Keep Rocking. what is l arginine used for
Oops! Looks like spam! Waiting for moderator approval.
28-09-21, 12:51 p.m. browning

Login to add comment
Oops! Looks like spam! Waiting for moderator approval


0
Great! Your article is quite good and many good comments. A little sideline if you are also an entertainment lover, please play Moto X3M with me
Oops! Looks like spam! Waiting for moderator approval.
29-09-21, 12:12 p.m. Sermakd

Login to add comment
Oops! Looks like spam! Waiting for moderator approval


0
Only strive to mention one's content can be as incredible. This clarity with your post is superb! Thanks a lot, hundreds of along with you should go on the pleasurable get the job done. prefnancy
Oops! Looks like spam! Waiting for moderator approval.
29-09-21, 7:12 p.m. browning

Login to add comment
Oops! Looks like spam! Waiting for moderator approval


0
I really loved reading your blog. It was very well authored and easy to undertand. Unlike additional blogs I have read which are really not tht good. I also found your posts very interesting. In fact after reading, I had to go show it to my friend and he ejoyed it as well! https://locationsnearmenow.net
Oops! Looks like spam! Waiting for moderator approval.
02-10-21, 6:17 p.m. browning

Login to add comment
Oops! Looks like spam! Waiting for moderator approval


0
I think this is an informative post and it is very useful and knowledgeable. therefore, I would like to thank you for the efforts you have made in writing this article. restaurants near me
Oops! Looks like spam! Waiting for moderator approval.
03-10-21, 3:25 p.m. BrianaBalducci

Login to add comment
Oops! Looks like spam! Waiting for moderator approval


0
Took me time to read all the comments, but I really enjoyed the article. It proved to be Very helpful to me and I am sure to all the commenters here! It’s always nice when you can not only be informed, but also entertained! click here
Oops! Looks like spam! Waiting for moderator approval.
04-10-21, 9:43 p.m. browning

Login to add comment
Oops! Looks like spam! Waiting for moderator approval


0
The bed is the memory foam that is made of the same material. The foam mattress is the most common material for the body. truck mattress
Oops! Looks like spam! Waiting for moderator approval.
05-10-21, 9:04 p.m. browning

Login to add comment
Oops! Looks like spam! Waiting for moderator approval


0
Nice to be visiting your blog again, it has been months for me. Well this article that i’ve been waited for so long. I need this article to complete my assignment in the college, and it has same topic with your article. Thanks, great share. Winter Tires Ottawa
Oops! Looks like spam! Waiting for moderator approval.
12-10-21, 5:41 p.m. browning

Login to add comment
Oops! Looks like spam! Waiting for moderator approval


0
Pretty good post. I have just stumbled upon your blog and enjoyed reading your blog posts very much. I am looking for new posts to get more precious info. Big thanks for the useful info. onewalmartwire
Oops! Looks like spam! Waiting for moderator approval.
13-10-21, 12:38 p.m. browning

Login to add comment
Oops! Looks like spam! Waiting for moderator approval


Log-in to answer to this question.