CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > General Forums > Main CFD Forum

Cebeci Smith-Eddy viscosity

Register Blogs Community New Posts Updated Threads Search

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   December 21, 2023, 09:46
Default Cebeci Smith-Eddy viscosity
  #1
New Member
 
The real turbulence
Join Date: Nov 2023
Posts: 3
Rep Power: 2
spirosk is on a distinguished road
Hello! I am trying to implement the Cebeci-Smith model the model calculates the eddy viscosity(turbulent kinematic viscosity) by finding the first y_{m} in which (v_{t})inner=(v_{t})outer and assigning the (v{t})inner in y<ym and outer otherwise. I don't understand how can i assign a value in y, because in my program in matlab, i have to assign a value of v_{t} for each x, not y as the model says! I tried to do this by calculating both inner and outer for all the points in my mesh and then finding the first ym in which they are equal and assigning at first (v_{t})inner and then for y>ym, (v_{t})outer, i post my code:
for j=2:J+1
for i = 2: K+1
if emt_inner(i,j) - emt_outer(i,j) <0 && flag
emt(i,j) = emt_inner(i,j);
else
flag=0;
emt(i,j) = emt_outer(i,j);
end

if emt(i,j) <0
emt(i,j)=0;
end

end
end

I turn zero emt where has zero values.I am not sure if this is correct. Please if somebody has any thoughts or has implemented this model i would be pleased if he helps me because i have been stuck for a long time!
spirosk is offline   Reply With Quote

Old   December 24, 2023, 03:27
Default
  #2
New Member
 
The real turbulence
Join Date: Nov 2023
Posts: 3
Rep Power: 2
spirosk is on a distinguished road
Nobody can help?
spirosk is offline   Reply With Quote

Reply

Tags
cebeci-smith, eddy viscosity model, turbulence, turbulence modeling


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Inconsistent Eddy Viscosity jonasa97 CFX 4 May 6, 2022 11:16
LES question: Why must the eddy viscosity be rotation-invariant? ulfu Main CFD Forum 8 April 16, 2019 03:09
Problem with divergence TDK FLUENT 13 December 14, 2018 06:00
What is linear eddy viscosity toboto Main CFD Forum 2 January 12, 2018 18:30
Ratio of eddy viscosity to molecular viscosity : Laminar or turbulent flow? JuPa CFX 7 September 9, 2013 07:45


All times are GMT -4. The time now is 07:12.