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

Blasius equation help :(

Register Blogs Members List Search Today's Posts Mark Forums Read

Reply
 
LinkBack Thread Tools Display Modes
Old   March 18, 2011, 18:57
Default Blasius equation help :(
  #1
New Member
 
John
Join Date: Mar 2011
Posts: 1
Rep Power: 0
johnt447 is on a distinguished road
Hello so I'm working on the blasius solution for incompressible viscous flow. So far I have solved for f' and successfully plotted a graph of flow speed against . So from what I understand this is correct I got a gradient of velocity from 0 to the flow speed. Now i want to extend it to different values of x. Now this is my issue, the book I have has a equation for du/dy so my plan was find the gradient for each different value of x, hence since i know it always starts at 0 and ends at the flow speed i could find the points in between. Although when trying the equation out I found my gradient was in fact decreasing as x increases. As far as I understood the gradient (du/dy) should become larger as x increases. The equation I'm using is this


where is flow speed, is kinematic viscosity, u is speed and why y and x are the coordinates.

So what I did was use the equation with f''(0) bit included I wasn't sure if that has to change I thought since the gradient in a incompressible flow is constant.

Also there is something I'm not sure about, I have set the y velocity to 0. so i just have vectors going horizontal. I wasn't sure if that is right or not looking from the diagram in a textbook i have seemed right but I'm not sure .
johnt447 is offline   Reply With Quote

Reply

Thread Tools
Display Modes

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 On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Calculation of the Governing Equations Mihail CFX 7 September 7, 2014 06:27
blasius equation varunjain89 Main CFD Forum 15 June 25, 2012 09:42
Constant velocity of the material Sas CFX 15 July 13, 2010 08:56
mass flow in is not equal to mass flow out saii CFX 2 September 18, 2009 08:07
Blasius equation. Lawal Main CFD Forum 7 November 15, 2004 15:45


All times are GMT -4. The time now is 01:04.