An irrotational flow in the r-y plane is represented by the potential function 0 = x² + xy – y², where o has units of ft2/s. (a) (b) (c) the coordinates are given in ft. Hint: Use the terms of the Navier-Stokes equation. Show that the flow is also incompressible. Determine the stream function . Compute the magnitude of the fluid acceleration at the point (1,1), where

Elements Of Electromagnetics
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**Flow Analysis in the x-y Plane**

An irrotational flow in the \(x\)-\(y\) plane is represented by the potential function \(\phi = x^2 + xy - y^2\), where \(\phi\) has units of ft\(^2\)/s.

**Tasks:**

1. **Incompressibility:**
   - Show that the flow is also incompressible.

2. **Stream Function:**
   - Determine the stream function \(\psi\).

3. **Fluid Acceleration:**
   - Compute the magnitude of the fluid acceleration at the point \((1,1)\), where the coordinates are given in feet. *Hint: Use the terms of the Navier-Stokes equation.*
Transcribed Image Text:**Flow Analysis in the x-y Plane** An irrotational flow in the \(x\)-\(y\) plane is represented by the potential function \(\phi = x^2 + xy - y^2\), where \(\phi\) has units of ft\(^2\)/s. **Tasks:** 1. **Incompressibility:** - Show that the flow is also incompressible. 2. **Stream Function:** - Determine the stream function \(\psi\). 3. **Fluid Acceleration:** - Compute the magnitude of the fluid acceleration at the point \((1,1)\), where the coordinates are given in feet. *Hint: Use the terms of the Navier-Stokes equation.*
Expert Solution
Step 1

Given data

The potential function of the flow is ϕ=x2+xy-y2.

 

Step 2

(a)

The velocity in the x-direction is as follows:
u=-dϕdxu=-2x-y

The velocity in the y-direction is as follows:
v=-dϕdyv=2y-x

Now, the calculate the flow is in-compressible or compressible as follows:

 dudx+dvdyd(-2x-y)dx+d(2y-x)dy-2+20The flow is incompressible.

Step 3

(b)

Calculate the stream function from the velocity function as follows:

dψdy=dϕdxdψdy=d(x2+xy-y2)dxdψdy=2x+ydψ=2x+ydyψ=2xy+y22+C

Here, C is the integration constant.

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