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AA210A Fundamentals of Compressible Flow Chapter 3 - Control volumes, vector calculus 10/4/20 1

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Page 1: AA210A Fundamentals of Compressible Flowcantwell/AA210A_Course...Problem 7 - Verify Stokes' theorem (V x F) ñdV = F • (3.34) where F = (x, y, z) and A is the surface of a cube of

AA210AFundamentals of Compressible Flow

Chapter 3 - Control volumes, vector calculus

10/4/20 1

Page 2: AA210A Fundamentals of Compressible Flowcantwell/AA210A_Course...Problem 7 - Verify Stokes' theorem (V x F) ñdV = F • (3.34) where F = (x, y, z) and A is the surface of a cube of

3.1 Control volume definition

The control volume is a closed, simply connected region in space.

A(t)

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Page 3: AA210A Fundamentals of Compressible Flowcantwell/AA210A_Course...Problem 7 - Verify Stokes' theorem (V x F) ñdV = F • (3.34) where F = (x, y, z) and A is the surface of a cube of

3.2 Vector calculus

Gradient operator

Gradient of a scalar

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Page 4: AA210A Fundamentals of Compressible Flowcantwell/AA210A_Course...Problem 7 - Verify Stokes' theorem (V x F) ñdV = F • (3.34) where F = (x, y, z) and A is the surface of a cube of

Gradient of a vector.

Divergence of a vector.

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Page 5: AA210A Fundamentals of Compressible Flowcantwell/AA210A_Course...Problem 7 - Verify Stokes' theorem (V x F) ñdV = F • (3.34) where F = (x, y, z) and A is the surface of a cube of

The Kronecker unit tensor.

The dot product of a vector and a tensor.

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Page 6: AA210A Fundamentals of Compressible Flowcantwell/AA210A_Course...Problem 7 - Verify Stokes' theorem (V x F) ñdV = F • (3.34) where F = (x, y, z) and A is the surface of a cube of

Curl of a vector.

Curl in index notation

The alternating unit tensor (Levi-Civita tensor)

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Page 7: AA210A Fundamentals of Compressible Flowcantwell/AA210A_Course...Problem 7 - Verify Stokes' theorem (V x F) ñdV = F • (3.34) where F = (x, y, z) and A is the surface of a cube of

Useful identities involving the Kronecker and alternating tensors

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Page 8: AA210A Fundamentals of Compressible Flowcantwell/AA210A_Course...Problem 7 - Verify Stokes' theorem (V x F) ñdV = F • (3.34) where F = (x, y, z) and A is the surface of a cube of

Some useful vector identities.

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Page 9: AA210A Fundamentals of Compressible Flowcantwell/AA210A_Course...Problem 7 - Verify Stokes' theorem (V x F) ñdV = F • (3.34) where F = (x, y, z) and A is the surface of a cube of

Some more vector identities - this time involving second derivatives.

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Page 10: AA210A Fundamentals of Compressible Flowcantwell/AA210A_Course...Problem 7 - Verify Stokes' theorem (V x F) ñdV = F • (3.34) where F = (x, y, z) and A is the surface of a cube of

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Page 11: AA210A Fundamentals of Compressible Flowcantwell/AA210A_Course...Problem 7 - Verify Stokes' theorem (V x F) ñdV = F • (3.34) where F = (x, y, z) and A is the surface of a cube of

The Laplacian.

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Page 12: AA210A Fundamentals of Compressible Flowcantwell/AA210A_Course...Problem 7 - Verify Stokes' theorem (V x F) ñdV = F • (3.34) where F = (x, y, z) and A is the surface of a cube of

3.3 Gauss’ theoremThis famous theorem in vector calculus can be used to convert a volume integral involving the gradient to a surface integral.

The variable F can be a scalar, vector or tensor.

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Page 13: AA210A Fundamentals of Compressible Flowcantwell/AA210A_Course...Problem 7 - Verify Stokes' theorem (V x F) ñdV = F • (3.34) where F = (x, y, z) and A is the surface of a cube of

A volume integral involving the curl can be converted to a surface integral.

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Page 14: AA210A Fundamentals of Compressible Flowcantwell/AA210A_Course...Problem 7 - Verify Stokes' theorem (V x F) ñdV = F • (3.34) where F = (x, y, z) and A is the surface of a cube of

Recall the development of the continuity equation

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Page 15: AA210A Fundamentals of Compressible Flowcantwell/AA210A_Course...Problem 7 - Verify Stokes' theorem (V x F) ñdV = F • (3.34) where F = (x, y, z) and A is the surface of a cube of

3.4 Stokes’ theorem

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Page 16: AA210A Fundamentals of Compressible Flowcantwell/AA210A_Course...Problem 7 - Verify Stokes' theorem (V x F) ñdV = F • (3.34) where F = (x, y, z) and A is the surface of a cube of

3.5 Problems

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Page 17: AA210A Fundamentals of Compressible Flowcantwell/AA210A_Course...Problem 7 - Verify Stokes' theorem (V x F) ñdV = F • (3.34) where F = (x, y, z) and A is the surface of a cube of

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