نتایج جستجو برای: tvd scheme
تعداد نتایج: 222941 فیلتر نتایج به سال:
We prove that isentropic gas flow does not admit non-degenerate TVD fields on any invariant set M(r0, s0) = {r0 < r < s < s0}, where r, s are Riemann coordinates. A TVD field refers to a scalar field whose spatial variation VarX(φ(τ(t,X), u(t,X))) is nonincreasing in time along entropic solutions. The result is established under the assumption that the Riemann problem defined by an overtaking s...
BACKGROUND The clinical significance of complete revascularization for ST segment elevation myocardial infarction (STEMI) patients during admission is still debatable. METHODS A total of 1406 STEMI patients from the Korean Myocardial Infarction Registry with multivessel diseases without cardiogenic shock who underwent primary percutaneous coronary intervention (PPCI) were analyzed. We used pr...
در این تحقیق، حرکت رسوب ناشی از شکست سد، در بستر متحرک به صورت دو بعدی، شبیه‌سازی عددی شده است. معادلات، در چارچوب روش حجم محدود منقطع شده و از شمای دو مرحله ای پیش‌بینی - اصلاح مک کورمک، برای حفظ دقت مرتبه دوم در مکان و زمان استفاده شده است. همچنین برای مهار نوسانات غیر واقعی و غیر فیزیکی از روش component-wise TVD به علت ساده تر بودن آن نسبت به دیگر روش‌های TVD به خاطر عدم نیاز به ماتریس ژاکوب...
In this paper, we present total variation diminishing (TVD) multigrid methods for computing the steady state solutions for systems of hyperbolic conservation laws. An efficient multigrid method should avoid spurious numerical oscillations. This can be achieved by designing methods which preserve monotonicity and TVD properties through the use of upwind interpolation and restriction techniques. ...
INTRODUCTION Waiting-time prior to radiotherapy is a well-known problem. This study aims to determine the impact of time on tumor growth in a patient population with squamous-cell carcinoma of the head and neck (SCCHN). MATERIAL AND METHODS In a consecutive cohort, all patients with both a diagnostic scan and a treatment-planning scan were identified. In total 648 patients were seen, and 414 ...
We present a newly developed cosmological hydrodynamics code based on weighted essentially non-oscillatory (WENO) schemes for hyperbolic conservation laws and related Hamilton-Jacobi equations. WENO is a higher order accurate finite difference scheme designed for problems with piecewise smooth solutions containing discontinuities, and has been successful in application for problems involving bo...
We have developed a new three-dimensional general relativistic magnetohydrodynamic (GRMHD) code, RAISHIN, using a conservative, high resolution shock-capturing scheme. The numerical fluxes are calculated using the Harten, Lax, & van Leer (HLL) approximate Riemann solver scheme. The fluxinterpolated, constrained transport scheme is used to maintain a divergence-free magnetic field. In order to e...
Viriato is a novel fluid–kinetic code that solves a reduced-gyrokinetic set of equations [the Kinetic Reduced Electron Heating Model (KREHM) equations, which reduce to the standard Reduced-MHD equations in the appropriate limit]. Two main applications of these equations are magnetized (Alfvénic) plasma turbulence and magnetic reconnection. Viriato uses operator splitting (Strang or Godunov) to ...
In Xu [14], a class of parametrized flux limiters is developed for high order finite difference/volume essentially non-oscillatory (ENO) and Weighted ENO (WENO) schemes coupled with total variation diminishing (TVD) Runge-Kutta (RK) temporal integration for solving scalar hyperbolic conservation laws to achieve strict maximum principle preserving (MPP). In this paper, we continue along this lin...
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