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New Accurate and Efficient Method for Stiff Detonation Capturing

机译:精确而有效的刚性爆震捕获新方法

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摘要

An alternative approach to prevent spurious behavior caused by conventional shock-capturing schemes when solving stiff detonation wave problems is introduced. In engineering research of detonation waves, conventional shock-capturing schemes usually encounter difficulties in identifying the location of the detonation front because the discontinuous solution is smeared. To overcome this excessive numerical dissipation with traditional discretized schemes used in nonreacting high-speed compressible flow, a shock-capturing scheme is introduced in which, besides the linear function constructed in the monotone upstream-centered schemes for conservation law (MUSCL) scheme, a steplike tangent of hyperbola for interface capturing (THINC) function is also employed in the reconstruction process. The final reconstruction function is determined using the boundary variation diminishing (BVD) algorithm, which reduces significantly the numerical dissipation around discontinuities. One- and two-dimensional comparative numerical tests of stiff detonation wave problems were conducted with the fifth-order weighted essentially nonoscillatory and MUSCL-THINC-BVD schemes, demonstrating that the latter scheme reproduces the correct position of detonation waves with improved resolution, whereas the former scheme, despite the higher order, produces spurious waves. Compared with other methods, which, by accepting smeared-out discontinuities profiles, require extra treatments, the current method obtains the correct but also sharp detonation front by fundamentally reducing numerical dissipation errors in shock-capturing schemes.
机译:引入了另一种方法来防止在解决刚性爆震波问题时由常规的震动捕获方案引起的虚假行为。在爆震波的工程研究中,传统的捕捉震荡的方案通常会在确定爆震前沿的位置时遇到困难,因为不连续溶液被涂抹了。为了克服用于非反应性高速可压缩流的传统离散方案来克服这种过大的数值耗散,引入了一种震荡捕获方案,其中,除了在单调上游中心守恒法则(MUSCL)中构造的线性函数外,重建过程中还采用了用于界面捕获(THINC)功能的双曲线阶梯状切线。最终的重建函数是使用边界变化量递减(BVD)算法确定的,该算法显着降低了不连续点周围的数值耗散。使用五阶加权基本非振荡和MUSCL-THINC-BVD方案进行了刚性爆震波问题的一维和二维比较数值测试,表明后一种方案以更高的分辨率再现了爆轰波的正确位置,而前一种方案尽管阶数较高,但仍会产生杂散波。与其他方法相比,其他方法需要接受额外的处理,因为这些方法需要接受涂抹痕迹的不连续性轮廓,因此,通过从根本上减少震荡捕获方案中的数值耗散误差,可以获得正确但尖锐的爆轰波锋。

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