共查询到20条相似文献,搜索用时 15 毫秒
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Vladan D. Djordjević 《Zeitschrift für Angewandte Mathematik und Physik (ZAMP)》1971,22(6):1077-1082
Summary In this work equations of boundary layers on arbitrary smooth surfaces are derived which are moving relatively slowly through a rotating fluid. For the case of the impulsive start of the motion from rest, the equations are solved exactly for arbitrary velocities at the outer edge of the boundary layer. The results are applied to the case of the motion of a sphere in the direction of the axis of revolution using Stewartson's velocity at the outer edge. The boundary layer calculated in such a way does not separate from the sphere surface; this makes it possible to calculate the total drag. The formula reduces for the case of non-viscous fluid to the known result given by Stewartson. 相似文献
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Mixed boundary value problems for the wave-equation in the x-y-plane, with boundaries parallel to the x-axis, are usually treated by Laplacetransformation. To use this method numerically we present it here by means of the Mikusiński-calculus. In this paper our main interest lies in the treatment of mixed initial-boundary value problems arising in unsteady subsonic cascade flow. 相似文献
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Hans Zogg 《Zeitschrift für Angewandte Mathematik und Physik (ZAMP)》1976,27(1):41-48
Zusammenfassung Es wird eine Methode zur Berechnung der Diffraktion von schwachen Stössen an schlanken Körpern angegeben. Bei symmetrischen Körpern lässt sich der Druck durch eine Integration berechnen. Die Methode wird auf einige Beispiele wie Keil und parabelförmige Körper angewendet. Bei Keilen wird Uebereinstimmung mit entsprechenden Grenzfällen von bekannten allgemeineren Lösungen gefunden. Es werden asymptotische Ausdrücke angegeben, unter anderem für den Effekt der endlichen Dicke von ebenen Platten. Der Effekt der Anstellung wird durch Superposition berücksichtigt.
A method is presented for calculating the diffraction of weak shock waves by slender bodies. For symmetric bodies the calculation of the pressure reduces to an integration. With this method the diffracted pressure is determined for a few examples like a wedge and parabolic bodies. For wedges agreement is found with the corresponding limits of well known conical solutions. Asymptotic expressions are given, including for the effect of thickness of plane plates. Angles of attack are accounted for by superposition.相似文献
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