uggs kopen High-resolution numerical method of two

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Numerical method of two high-resolution wave-front of non-uniform flow of the variable cross-section tube comparison of propagation of shock

【Hodl - SubsonlcbeForetheshock2 - Sper ∞ nlcbeforetheshock'l Pi Yoshishige Oh resistant core twilight fan i 3 Wu Qingsong: l song kind of high resolution numerical methods if both operators have non-plastic wave front falling falling falling into plastic plastic barricade fell Ken Fort plastic fall Ramie some bamboo look,[link widoczny dla zalogowanych]! () shock intensity-M, changes in the dissemination of population 1Varia heshockin 【【【ionof erDil 【y (M.) durningpro ~ gation speed of any particular time in the spatial distribution of J r) Spacedislri1u1iOli ( 1 『.1 hevelocIlv flail Jia Jiang Jiang sundial back down anthill h) when the pressure in a specific spatial distribution in cyberspace h) Spacedlstribulionolthe-plessureia 【【aIntirileJ acer density air at a given time to ask a rising market Spaced1nbution'1fIhede) ~ si1Jd1Jcel (a1ii 【 ],[! SLJper ~) fficbefore 【heshockl P repair bi l foment 【slightly off the buds can be seen from the figure,[link widoczny dla zalogowanych], two different calculation methods, the results are basically the same. numerical simulation reveals the shock wave front in the non-uniform steady flow of tapered pipe propagation, wave after wave intensity and flow field features show complex changes: the expansion tube (Figure 2), Wavefront for the subsonic flow, the shock strength gradually weakened; wave front for the supersonic flow, shock intensity gradually. on the contractile tube (Fig. 3), the result-f the opposite Taiwan clever. If the shock transition in the reduced transmission of the wave after the ultra-sound flow. then the wave may be produced after the bombing and the impact of 9 2I8 volume of secondary students shock; enhanced if the shock wave propagation, the wave will not produce a strong jump. But the wave back of the court system due to the interaction between a series of waves. entropy flow are non-. the rule of resting before shock pipe flow with the principle of difference. can be seen from the figure, l can be calculated by the two sharp high-resolution discontinuous solutions. operator method available to non-randomly selected thickness of the shock, but in the area smooth solution,[link widoczny dla zalogowanych], there caused by the random sampling process of digital pulse (digital noise). In order to reduce Rong tone, usually shorten the calculation step approach, which is bound to increase computing time. to promote the Riemann problem for higher order Godunov method based on the general need to a grid point,[link widoczny dla zalogowanych], up to smooth over the two grid shock, although the thickness of the break, but still sharp. and in the smooth solution area, second-order accuracy, and no digital noise from the calculation of time to read, RCM for the two-step method. to GodunOV type GRP-based one-step method. each time step, each grid interval, two steps need to bang a million Rle2111itllrl solutions of the problem, step one only solution. Although the processes and procedures which implement the solution complicated than the former, But even in this example is to take steps under the same terms, the latter than the former at least 40% saving machine. If we consider the number of RCM for further noise reduction step, then. This order Godunov-type method of calculation than the RCM will be smaller. G0dunov type methods can be understood as the first exact solution with discontinuous decomposition, and then add in the sub regional average distribution function by the new step process. discontinuous decomposition, although the accuracy of calculation of the average process is critical, but we that there are some errors in the average process of discontinuous solutions can often compensate for each other. And finally get a realistic average. no iterative approximate Riemann solutions and exact solutions are iterative results are very consistent. a certain sense, can be seen as this is the role of the average effect. this example, the use of non-iterative solution than the iterative solution has saved ~ Ut, j35% or so. due to random selection method is determined by sampling the solution process, it is the direct use of discontinuous solutions The average results without the process. If no-iterative Riemann approximate solution, the error will be fully entered the final results, and increase over time. accumulated error increases, open this approximation the random selection method is not appropriate. Fourth, the conclusion by calculating, we appreciate the use of randomly selected operator method and the Riemann problem based on the promotion of higher order Godunov-type solutions of the finite difference method to calculate storage
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