|
[Sponsors] |
local distribution of Nusselt Number in Ansys CFX |
|
LinkBack | Thread Tools | Search this Thread | Display Modes |
November 21, 2017, 22:24 |
local distribution of Nusselt Number in Ansys CFX
|
#1 |
New Member
CongTao
Join Date: Nov 2017
Posts: 5
Rep Power: 8 |
Hi,
i'm doing a simulation of annular finned tubes on my CFX.Now,i want to make a contour plot of the local Nusselt number .However,I've been using the software for a month.i don't know how to make it. Can someone please direct me on how to make the contour plot just like this one. Help please. Thanks. |
|
November 22, 2017, 14:04 |
|
#2 |
Senior Member
Erik
Join Date: Feb 2011
Location: Earth (Land portion)
Posts: 1,184
Rep Power: 23 |
What are you asking? How to make a contour plot? How to calculate nusselt number?
For Nusselt and HTC, see the FAQs. |
|
November 22, 2017, 20:39 |
|
#3 | |
New Member
CongTao
Join Date: Nov 2017
Posts: 5
Rep Power: 8 |
Quote:
English is not my first language,so i didn't express my problem accurately.i'm sorry for this.[ATTACH][/ATTACH] |
||
November 23, 2017, 01:21 |
|
#4 |
Senior Member
urosgrivc
Join Date: Dec 2015
Location: Slovenija
Posts: 365
Rep Power: 11 |
+First you make a plane where you want to show your contour.
+Than you make a contour with a location (plane) and colors nuselt number. +than you disable the plane in the tree because it is grey by default and you dont need it. if you dont disable it you will have two planes on the same place which will interfere with eachother. |
|
November 23, 2017, 02:36 |
|
#5 |
New Member
CongTao
Join Date: Nov 2017
Posts: 5
Rep Power: 8 |
Thanks for your suggestion.Maybe i didn't express my problem accurately.I know how to make a contour plot of Variables.However,i don't konw How to write the expressions of Nu on my CFX.I try to define the Nusselt number,but it didn't work well.Do you have any examples of doing it?
|
|
November 27, 2017, 09:11 |
|
#6 |
Senior Member
Erik
Join Date: Feb 2011
Location: Earth (Land portion)
Posts: 1,184
Rep Power: 23 |
I told you once already to see the FAQs for Nusselt number and HTC info.
https://www.cfd-online.com/Wiki/Ansy...ficient_in_CFX |
|
November 27, 2017, 09:48 |
|
#7 |
New Member
CongTao
Join Date: Nov 2017
Posts: 5
Rep Power: 8 |
Thank you for your suggertion.i have done it following the FAQs.Maybe the bulk temperature I have setted is wrong,so the result is not very well.The bulk temperature that i calculated by the mass average temperature .Is it right?
|
|
November 27, 2017, 21:45 |
|
#8 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,830
Rep Power: 144 |
You will need to look at what the results you are comparing against has done to determine whether mass average temperature is appropriate.
Don't forget that your simulation may "simply" be inaccurate, again this is an FAQ: https://www.cfd-online.com/Wiki/Ansy..._inaccurate.3F |
|
November 28, 2017, 01:01 |
|
#9 |
Senior Member
urosgrivc
Join Date: Dec 2015
Location: Slovenija
Posts: 365
Rep Power: 11 |
MyHTC = (Wall Heat Flux / (((Wall Heat Flux / Wall Heat Transfer Coefficient) + Wall Adjacent Temperature) -298.15[K]))
This shoul work for htc. 298.15K is the ambient temp in this case. Althoug I usualy prefer to go by the other method and set T-bulk in expert parameters. I dont understand this part.. "The bulk temperature that i calculated by the mass average temperature .Is it right?" It can be what ever you like, you have to decide what are you going to use this HTC for in the future |
|
November 28, 2017, 07:39 |
|
#10 |
New Member
CongTao
Join Date: Nov 2017
Posts: 5
Rep Power: 8 |
Thanks a lot.i want to get the local Nusselt number along the fin.Maybe i need to get the expression of the mass average temperature along the air flow direction.
|
|
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Decomposing meshes | Tobi | OpenFOAM Pre-Processing | 22 | February 24, 2023 09:23 |
[snappyHexMesh] Error snappyhexmesh - Multiple outside loops | avinashjagdale | OpenFOAM Meshing & Mesh Conversion | 53 | March 8, 2019 09:42 |
[mesh manipulation] Mesh Refinement | Luiz Eduardo Bittencourt Sampaio (Sampaio) | OpenFOAM Meshing & Mesh Conversion | 42 | January 8, 2017 12:55 |
foam-extend_3.1 decompose and pyfoam warning | shipman | OpenFOAM | 3 | July 24, 2014 08:14 |
IcoFoam parallel woes | msrinath80 | OpenFOAM Running, Solving & CFD | 9 | July 22, 2007 02:58 |