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    ∂T

    ∂t+ u · ∇T = κT∇2T

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    D

    Dt

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    ′ U

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    Dt= − 1

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    DS

    Dt= κS∇2S

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  • 20 40 60 80 100 120 140 160 180 200

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    ¢vG = 0

    ¢τx = 1

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    U =∫ 0

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    ρ0fτy

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    V =∫ 0

    −∞ (v − vG) dz = −1

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    ∂u

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