# Chapter 6: Incompressible Inviscid Flow

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1 Chapter 6: Incompressible Inviscid Flow 6-1 Introduction 6-2 Nondimensionalization of the NSE 6-3 Creeping Flow 6-4 Inviscid Regions of Flow 6-5 Irrotational Flow Approximation 6-6 Elementary Planar Irrotational Flows 6-7 Examples of Irrotational Flows Formed by Superposition Chapter 6 Incompressible Inviscid Flow

2 6-1 Introduction In Chap. 5, we derived the NSE and developed several exact solutions. In this Chapter, we will study several methods for simplifying the NSE, which permit use of mathematical analysis and solution These approximations often hold for certain regions of the flow field.

3 6-2 Nondimensionalization of the NSE (1) Purpose: Order-of-magnitude analysis of the terms in the NSE, which is necessary for simplification and approximate solutions. We begin with the incompressible NSE Each term is dimensional, and each variable or property (ρ, V, t, μ, etc.) is also dimensional. What are the primary dimensions of each term in the NSE equation?

4 6-2 Nondimensionalization of the NSE (2) To nondimensionalize, we choose scaling parameters as follows

5 6-2 Nondimensionalization of the NSE (3) Next, we define nondimensional variables, using the scaling parameters in Table 10-1 To plug the nondimensional variables into the NSE, we need to first rearrange the equations in terms of the dimensional variables

6 6-2 Nondimensionalization of the NSE (4) Now we substitute into the NSE to obtain Every additive term has primary dimensions {m 1 L -2 t - 2 }. To nondimensionalize, we multiply every term by L/(ρV 2 ), which has primary dimensions {m -1 L 2 t 2 }, so that the dimensions cancel. After rearrangement,

7 6-2 Nondimensionalization of the NSE (5) Terms in [ ] are nondimensional parameters Strouhal number Euler number Inverse of Froude number squared Inverse of Reynolds number Navier-Stokes equation in nondimensional form

8 6-2 Nondimensionalization of the NSE (6) Nondimensionalization vs. Normalization NSE are now nondimensional, but not necessarily normalized. What is the difference? Nondimensionalization concerns only the dimensions of the equation - we can use any value of scaling parameters L, V, etc. Normalization is more restrictive than nondimensionalization. To normalize the equation, we must choose scaling parameters L,V, etc. that are appropriate for the flow being analyzed, such that all nondimensional variables are of order of magnitude unity, i.e., their minimum and maximum values are close to 1.0. If we have properly normalized the NSE, we can compare the relative importance of the terms in the equation by comparing the relative magnitudes of the nondimensional parameters St, Eu, Fr, and Re.

9 6-3 Creeping Flow (1) Also known as Stokes Flow or Low Reynolds number flow Occurs when Re << 1 ρ, V, or L are very small, e.g., micro-organisms, MEMS, nano-tech, particles, bubbles μ is very large, e.g., honey, lava

10 6-3 Creeping Flow (2) To simplify NSE, assume St ~ 1, Fr ~ 1 Pressure forces Viscous forces Since

11 6-3 Creeping Flow (3) This is important Very different from inertia dominated flows where Density has completely dropped out of NSE. To demonstrate this, convert back to dimensional form. This is now a LINEAR EQUATION which can be solved for simple geometries.

12 6-3 Creeping Flow (4) Solution of Stokes flow is beyond the scope of this course. Analytical solution for flow over a sphere gives a drag coefficient which is a linear function of velocity V and viscosity m.

13 6-4 Inviscid Regions of Flow (1) Definition: Regions where net viscous forces are negligible compared to pressure and/or inertia forces ~0 if Re large Euler Equation

14 6-4 Inviscid Regions of Flow (2) Euler equation often used in aerodynamics Elimination of viscous term changes PDE from mixed elliptichyperbolic to hyperbolic. This affects the type of analytical and computational tools used to solve the equations. Must relax wall boundary condition from no-slip to slip No-slip BC u = v = w = 0 Slip BC τ w = 0, V n = 0 V n = normal velocity

15 6-5 Irrotational Flow Approximation (1) Irrotational approximation: vorticity is negligibly small In general, inviscid regions are also irrotational, but there are situations where inviscid flow are rotational, e.g., solid body rotation

16 6-5 Irrotational Flow Approximation (2) What are the implications of irrotational approximation. Look at continuity and momentum equations. Continuity equation Use the vector identity Since the flow is irrotational φ is a scalar potential function

17 6-5 Irrotational Flow Approximation (2) Therefore, regions of irrotational flow are also called regions of potential flow. From the definition of the gradient operator Cartesian Cylindrical Substituting into the continuity equation gives

18 6-5 Irrotational Flow Approximation (3) This means we only need to solve 1 linear scalar equation to determine all 3 components of velocity! Laplace Equation Luckily, the Laplace equation appears in numerous fields of science, engineering, and mathematics. This means there are well developed tools for solving this equation.

19 6-5 Irrotational Flow Approximation (4) Momentum equation If we can compute φ from the Laplace equation (which came from continuity) and velocity from the definition, why do we need the NSE? To compute Pressure. To begin analysis, apply irrotational approximation to viscous term of the NSE = 0

20 6-5 Irrotational Flow Approximation (5) Therefore, the NSE reduces to the Euler equation for irrotational flow nondimensional dimensional Instead of integrating to find P, use vector identity to derive Bernoulli equation

21 6-5 Irrotational Flow Approximation (6) This allows the steady Euler equation to be written as This form of Bernoulli equation is valid for inviscid and irrotational flow since we ve shown that NSE reduces to the Euler equation.

22 6-5 Irrotational Flow Approximation (7) However, Inviscid Irrotational (ζ = 0)

23 6-5 Irrotational Flow Approximation (8) Therefore, the process for irrotational flow 1. Calculate φ from Laplace equation (from continuity) 2. Calculate velocity from definition 3. Calculate pressure from Bernoulli equation (derived from momentum equation) Valid for 3D or 2D

24 6-5 Irrotational Flow Approximation (9) For 2D flows, we can also use the streamfunction Recall the definition of streamfunction for planar (x-y) flows Since vorticity is zero, This proves that the Laplace equation holds for the streamfunction and the velocity potential

25 6-5 Irrotational Flow Approximation (10) 2-D Flow: Constant values of ψ: streamlines Constant values of φ: equipotential lines ψ and φ are mutually orthogonal ψ and φ are harmonic functions ψ is defined by continuity; 2 ψ results from irrotationality φ is defined by irrotationality; 2 φ results from continuity Flow solution can be achieved by solving either 2 φ or 2 ψ, however, BC are easier to formulate for ψ.

26 6-5 Irrotational Flow Approximation (11) 2-D Flow: Similar derivation can be performed for cylindrical coordinates (except for 2 ψ for axisymmetric flow) Planar, cylindrical coordinates : flow is in (r,θ) plane Axisymmetric, cylindrical coordinates : flow is in (r,z) plane Planar Axisymmetric

27 6-5 Irrotational Flow Approximation (12) 2-D Flow:

28 6-5 Irrotational Flow Approximation (13) 2-D Flow: Method of Superposition 1. Since 2 φ=0 is linear, a linear combination of two or more solutions is also a solution, e.g., if φ 1 and φ 2 are solutions, then (Aφ 1 ), (A+φ 1 ), (φ 1 +φ 2 ), (Aφ 1 +Bφ 2 ) are also solutions 2. Also true for y in 2D flows ( 2 ψ =0) 3. Velocity components are also additive

29 6-5 Irrotational Flow Approximation (14) Given the principal of superposition, there are several elementary planar irrotational flows which can be combined to create more complex flows. Uniform stream Line source/sink Line vortex Doublet

30 6-6 Elementary Planar Irrotational Flows (1) Uniform Stream In Cartesian coordinates Conversion to cylindrical coordinates can be achieved using the transformation

31 6-6 Elementary Planar Irrotational Flows (2) Line Source/Sink Potential and streamfunction are derived by observing that volume flow rate across any circle is This gives velocity components

32 6-6 Elementary Planar Irrotational Flows (3) Line Source/Sink Using definition of (U r, U θ ) These can be integrated to give φ and ψ Equations are for a source/sink at the origin

33 6-6 Elementary Planar Irrotational Flows (4) Line Source/Sink If source/sink is moved to (x,y) = (a,b)

34 6-6 Elementary Planar Irrotational Flows (5) Line Vortex Vortex at the origin. First look at velocity components These can be integrated to give φ and ψ Equations are for a source/sink at the origin

35 6-6 Elementary Planar Irrotational Flows (6) Line Vortex If vortex is moved to (x,y) = (a,b)

36 6-6 Elementary Planar Irrotational Flows (7) Doublet A doublet is a combination of a line sink and source of equal magnitude Source Sink

37 6-6 Elementary Planar Irrotational Flows (8) Doublet Adding ψ 1 and ψ 2 together, performing some algebra, and taking a 0 gives K is the doublet strength

38 6-7 Examples of Irrotational Flows Formed by Superposition (1) Superposition of sink and vortex : bathtub vortex Sink Vortex

39 6-7 Examples of Irrotational Flows Formed by Superposition (2) Flow over a circular cylinder: Free stream + doublet Assume body is ψ = 0 (r = a) K = Va 2

40 6-7 Examples of Irrotational Flows Formed by Superposition (3) Velocity field can be found by differentiating streamfunction On the cylinder surface (r=a) Normal velocity (U r ) is zero, Tangential velocity (U θ ) is non-zero slip condition.

41 6-7 Examples of Irrotational Flows Formed by Superposition (4) Turbulent separation Compute pressure using Bernoulli equation and velocity on cylinder surface Laminar separation Irrotational flow

42 6-7 Examples of Irrotational Flows Formed by Superposition (5) Integration of surface pressure (which is symmetric in x), reveals that the DRAG is ZERO. This is known as D Alembert s Paradox For the irrotational flow approximation, the drag force on any non-lifting body of any shape immersed in a uniform stream is ZERO Why? Viscous effects have been neglected. Viscosity and the noslip condition are responsible for Flow separation (which contributes to pressure drag) Wall-shear stress (which contributes to friction drag)

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