(a) If w = 6 + ih represents the complex potential of a flow and ap = x² – y? + %3D determine the function o. x² + y?' (b) Find the equation for stream lines and equipotential lines represented by f(2) = az?, where a is a constant and z = x + iy. (c) For the function in (b) show that the speed is everywhere proportional to the distance from the origin.

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
icon
Related questions
icon
Concept explainers
Question

1.

1. Consider two dimensional irrotational motion in a plane parallel to xy - plane.
The velocity v of fluid can be expressed as,
Vại + vyj
V =
Since the motion is irrotational, a scalar function ø(x, y) gives the velocity
components.
V= φ(7, ) -
+j
= 1
Əx
ду
dy
On comparing (1) and (2), we get
Vr
Vy
dy
The scalar function (x, y) which gives the velocity component is called the
velocity potential function. As the fluid is incompressible,
Vv = 0 →
dy
Vgi + Vyj
dy
dx
Putting the values of
and
Vy
from (3) and (4), we get
Vx
dy?
This is Laplace equation. The function o is harmonic and it is a real part of
analytic function
f(2) = ¢(x, y) + inp (x, y)
By using (3) it can be shown that,
dy
Vy
ie
Vx
dx
dy
Here the resultant velocity
v? + v? of the fluid is along the tangent to the
curve
p(x, y) = C'
Such curves are known as stream lines and (x, y) is known as stream func-
tion.
The curves represented by ø(x, y)
As ø(x, y) and Þ(x, y) are conjugates of analytic function f(z), the equipoten-
tial lines and and stream lines intersects each other orthogonally.
Therefore,
= c are called eqipotential lines.
f'(2) = vn – ivy
The magnitude of the resultant velocity is /v? + v3. The function f(2) which
V
represents the flow pattern is called complex potential.
(а) If w %3
p = x² – y? +
O + ip represents the complex potential of a flow and
determine the function o.
x2 + y2'
(b) Find the equation for stream lines and equipotential lines represented
by f(z) = az², where a is a constant and z = x + iy.
(c) For the function in (b) show that the speed is everywhere proportional
to the distance from the origin.
||
Transcribed Image Text:1. Consider two dimensional irrotational motion in a plane parallel to xy - plane. The velocity v of fluid can be expressed as, Vại + vyj V = Since the motion is irrotational, a scalar function ø(x, y) gives the velocity components. V= φ(7, ) - +j = 1 Əx ду dy On comparing (1) and (2), we get Vr Vy dy The scalar function (x, y) which gives the velocity component is called the velocity potential function. As the fluid is incompressible, Vv = 0 → dy Vgi + Vyj dy dx Putting the values of and Vy from (3) and (4), we get Vx dy? This is Laplace equation. The function o is harmonic and it is a real part of analytic function f(2) = ¢(x, y) + inp (x, y) By using (3) it can be shown that, dy Vy ie Vx dx dy Here the resultant velocity v? + v? of the fluid is along the tangent to the curve p(x, y) = C' Such curves are known as stream lines and (x, y) is known as stream func- tion. The curves represented by ø(x, y) As ø(x, y) and Þ(x, y) are conjugates of analytic function f(z), the equipoten- tial lines and and stream lines intersects each other orthogonally. Therefore, = c are called eqipotential lines. f'(2) = vn – ivy The magnitude of the resultant velocity is /v? + v3. The function f(2) which V represents the flow pattern is called complex potential. (а) If w %3 p = x² – y? + O + ip represents the complex potential of a flow and determine the function o. x2 + y2' (b) Find the equation for stream lines and equipotential lines represented by f(z) = az², where a is a constant and z = x + iy. (c) For the function in (b) show that the speed is everywhere proportional to the distance from the origin. ||
Expert Solution
trending now

Trending now

This is a popular solution!

steps

Step by step

Solved in 4 steps

Blurred answer
Knowledge Booster
Points, Lines and Planes
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, advanced-math and related others by exploring similar questions and additional content below.
Recommended textbooks for you
Advanced Engineering Mathematics
Advanced Engineering Mathematics
Advanced Math
ISBN:
9780470458365
Author:
Erwin Kreyszig
Publisher:
Wiley, John & Sons, Incorporated
Numerical Methods for Engineers
Numerical Methods for Engineers
Advanced Math
ISBN:
9780073397924
Author:
Steven C. Chapra Dr., Raymond P. Canale
Publisher:
McGraw-Hill Education
Introductory Mathematics for Engineering Applicat…
Introductory Mathematics for Engineering Applicat…
Advanced Math
ISBN:
9781118141809
Author:
Nathan Klingbeil
Publisher:
WILEY
Mathematics For Machine Technology
Mathematics For Machine Technology
Advanced Math
ISBN:
9781337798310
Author:
Peterson, John.
Publisher:
Cengage Learning,
Basic Technical Mathematics
Basic Technical Mathematics
Advanced Math
ISBN:
9780134437705
Author:
Washington
Publisher:
PEARSON
Topology
Topology
Advanced Math
ISBN:
9780134689517
Author:
Munkres, James R.
Publisher:
Pearson,