双曲型守恒律的无振荡中心差分格式

讨论了双曲型守恒律的一类无振荡中心差分格式。Ｈ．Ｎｅｓｙａｈｕ和Ｅ．Ｔａｄｍｏｒ研究了以交错型ＬａｘＦｒｉｅｄｒｉｃｈ格式（ＬｘＦ）为模块的无振荡中心格式的构造与熵不等式。此类格式利用高阶的ＭＵＳＣＬ型插值替代一阶分片常数逼近，减少了ＬａｘＦｒｉｅｄｒｉｃｈ格式的过多数值粘性，建立了一维标量非线性双曲型守恒律的一类高分辨格式。讨论以非交错ＬａｘＦｒｉｅｄｒｉｃｈ格式为模块建立起的差分格式。证明了此格式具有二阶精度、ＴＶＤ性质并在一定条件下满足熵条件。

Non-Oscillatory Central Difference Schemes for Hyperbolic Conservation Laws

H.Nessyahu and E.Tadmor developed the staggered version of the LxF scheme. Using high resolution MUSCL type interpolation instead of piecewise constant approximation, it reduced the excessive numerical viscosity so that a high resolution scheme is built for the one dimensional non linear conservation laws. This paper proves that the non staggered LxF scheme has second order accuracy,TVD property and entropy inequality.