|
[Sponsors] |
March 18, 2011, 18:57 |
Blasius equation help :(
|
#1 |
New Member
John
Join Date: Mar 2011
Posts: 1
Rep Power: 0 |
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 . |
|
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
mass flow in is not equal to mass flow out | saii | CFX | 12 | March 19, 2018 06:21 |
Calculation of the Governing Equations | Mihail | CFX | 7 | September 7, 2014 07:27 |
blasius equation | varunjain89 | Main CFD Forum | 15 | June 25, 2012 10:42 |
Constant velocity of the material | Sas | CFX | 15 | July 13, 2010 09:56 |
Blasius equation. | Lawal | Main CFD Forum | 7 | November 15, 2004 15:45 |