An Introduction to Gravity Currents and Intrusions by Marius Ungarish

By Marius Ungarish

Gravity currents and intrusions are the ever-present phenomena the place a fluid of 1 density flows horizontally right into a fluid of a distinct density. For researchers and engineers, the facility to appreciate and expect those circulate fields is vital in wide-ranging purposes together with these concerned with atmospheric and ocean dynamics, the propagation of pollution, and the dispersion of volcanic clouds. even supposing many new theories, experimental info, simulation effects, and insights have surfaced lately, almost all these advancements stay scattered in journals and convention papers.  A systematic and unified creation to the sector, which contains the hot effects and advancements, is sure to facilitate the appliance of the on hand wisdom to either useful difficulties and extra investigations.  

 Written by way of a well-known authority lively in fresh advancements in gravity present learn, An creation to Gravity Currents and Intrusions presents an up to date, self-contained, and systematic creation to the learn, interpretation, and prediction of gravity present flows. the writer makes use of an easy mathematical framework to supply an available and accomplished creation to the mathematical and actual elements of this significant subject. The textual content offers researchers and practitioners with the basis required to formulate difficulties, interpret experimental effects and measurements info, receive basic and insightful analytical estimates and options, and advance or enforce numerical codes for similar difficulties. The publication additionally issues out gaps of data within the present figuring out that require additional research.

 This obtainable reference calls for just a simple history in fluid mechanics and utilized arithmetic, making it a fantastic foundation for researchers and engineers new to the sector. it could possibly additionally function a textbook for upper-level undergraduate and graduate point classes in fluid dynamics.

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For example, we can calculate γ by the requirement that at t = 10 the value of xN predicted by the finite-difference solution of the SW 2/3 equations (or provided by some accurate experiment) is equal to K(10 + γ) corresponding to the similarity solution. For the case illustrated in Fig. 12. It is not clear a priori that a given current will attain the self-similar behavior, or when this will happen. Experiments and numerical solutions of the SW equations (Rottman and Simpson 1983 Fig. 12, and Grundy and Rottman 1985a) show that the self-similar propagation is a robust feature of the gravity current.

82) where V ∗ is the dimensional volume of the current (per unit width of the 2D container). 79). The details are left for an exercise. This indeed proves that the similarity solution is independent of the shape of the lock. 34) is used and the geometry of the lock is rectangular. 68) can also be obtained. The similarity coordinate is, again, y = x/xN (t). The boundary conditions at y = 1 and the function ϕ(t) are as in the foregoing solution. 71) imposes β = (α + 2)/3. In general, however, the similarity profile of u is not linear with y.

Middle frames: the h and u profiles as a function of x for various t. Bottom frames: hN and uN vs. t, log-log axes. Lines (dashed) with slopes −2/3 and −1/3 are also show to emphasize the self-similar behavior at large t. Remark: t = t1 (∆)t2 denotes the times from t1 to t2 at interval ∆. © 2009 by Taylor & Francis Group, LLC 28 An introduction to gravity currents and intrusions viscous effects were fully discarded. Since both the thickness and velocity of the current decrease with time, the importance of the viscous friction relative to the inertial terms increases monotonically during the self-similar propagation.

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