Adaptive time-stepping analysis of nonlinear microwave heating problems

Space and Time Adaptive Two-Mesh hp-FEM for Transient Microwave Heating Problems

We propose a novel, highly efficient and accurate space and time adaptive higher-order finite element method (hp-FEM) for evolutionary microwave heating problems. Since the electric field E and temperature field T are very different in nature, we approximate them on individual meshes that change dynamically in time independently of each other. Although the approximations of E and T are defined ...

Nonlinear Behaviour of Time-stepping Algorithms for Initial Value Problems

Recent advances in nonlinear dynamical systems theory provide a new insight into numerical properties of discrete algorithms developed to solve nonlinear initial value problems. Basic features like accuracy and stability are well pointed out through diagrams or maps of computed asymptotic solutions in a suitable parametric space. Applying this methodology to a nonlinear test equation, we compar...

Newton Method for Nonlinear Dynamic Systems with Adaptive Time Stepping

This paper presents a nonlinear solver based on the Newton-Krylov methods, where the Newton equations are solved by Krylov-subspace type approaches. We focus on the solution of unsteady systems, in which the temporal terms are discretized by the backward Euler method using finite difference. To save computational cost, an adaptive time stepping is used to minimize the number of time steps. The ...

Time-domain Finite Element Analysis of Nonlinear Breakdown Problems in High- Power-microwave Devices and Systems

chemical recycling of polycarbonate waste using conventional heating and microwave assisted method

پلی کربنات یکی از پلاستیکهای مهمی است که به صورت گسترده در تولید لوحهای فشرده، قطعات رایانه، مواد ساختمانی و غیره مورد استفاده قرار می گیرد. این پلیمر بصورت عمده از تراکم مونومر بیس فنولa (bpa) و کربنیل کلرید یا دی متیل کربنات ها بدست می آید. در سالهای اخیر بازیافت شیمیایی پلی کربنات بیشتر مورد توجه بوده است. بازیافت شیمیایی پلی کربنات برای بدست آوردن مواد اولیه آن با روشهای متفاوتی مانند تجزی...