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首页> 外文期刊>International Journal of Heat and Mass Transfer >Simulating heat transfer from moving rigid bodies using high-order ghost-cell based immersed-boundary method
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Simulating heat transfer from moving rigid bodies using high-order ghost-cell based immersed-boundary method

机译：使用基于高阶重像元单元的沉浸边界方法模拟运动的刚体的传热

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摘要

In this paper we develop a new high-order ghost-cell based Immersed Boundary Method (IBM) for flow and thermal simulation of multiphase flow system with moving bodies, based on our previous edition with only stationary boundary treatment. The newly developed approach is validated by comparing with earlier reported simulation and experimental results of both the pressure drag coefficient of a prescribed harmonic in-line oscillating sphere and the trajectory, velocity history of a free falling sphere under gravity and the rising of a spherical catalyst particle in an enclosure, using relatively coarse mesh resolution. Excellent agreement is obtained, demonstrating the accuracy and efficiency of our newly developed method. Finally, we employ the new method to investigate the cooling process of a freely settling spherical particle under gravity, aiming at revealing the impact of natural convection on particle cooling. It turns out that the heat transfer and hydrodynamics interaction is the most obvious when the Richardson number is the largest in our simulations. When the Reynolds number equals, the Nusselt number is always higher for the no buoyancy case than the case with buoyancy force.
机译：在本文的基础上，我们仅基于固定边界处理，我们开发了一种新的基于高阶重像元的浸没边界方法（IBM），用于具有移动体的多相流系统的流动和热模拟。通过与早期报道的模拟和实验结果进行比较，对新开发的方法进行了验证，该仿真和实验结果是规定的谐波直列振荡球的压力阻力系数以及重力作用下自由下落的球的轨迹，速度历史以及球形催化剂的上升使用相对较粗的网格分辨率将粒子包含在外壳中。获得了极好的协议，证明了我们新开发的方法的准确性和效率。最后，我们采用新方法研究了自由沉降的球形颗粒在重力作用下的冷却过程，旨在揭示自然对流对颗粒冷却的影响。结果表明，当我们的模拟中的Richardson数最大时，传热和流体动力学的相互作用最为明显。当雷诺数相等时，无浮力情况的努塞尔特数总是比有浮力的情况高。

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