基于PHOENICS的地下工程岩土耦合传热动态模拟

传统的静态极限设计方法已经不能满足地下工程内部环境保障系统设计的经济合理有效要求。本文主要针对深埋地下上程的间歇加热工况，对工程内部环境与周围岩石的温度分布及耦合传热情况进行动态分析，并进一步指导动态设计。简化间歇机制下深埋拱形地下建筑的数学物理模型，采用整场求解方法，通过建立流体和固体区域的统一控制微分方程，将复杂的固体导热与流体对流换热通过彼此互为边界条件耦合起来。整个数值模拟过程采用大型计算软件PHOENICS3．4进行求解，并对现有软件程序加以改进得出经验模型，使CFD软件能更广泛应用于地下工程的通风空调设计中，为求解非稳态的导热和对流换热耦合问题提供了一种新的可行研究方法。此外还具体分析了进风风速、室内热源等方面的因素对温度分布的影响。

Dynamical Simulation of Conjugated Heat Transfer in Underground Engineering Based on PHOENICS

Conventional static designs no longer filled the demand of the economical and efficient interior environmental safeguard system in the underground engineering. This paper's main aim is at the intermittently heating of deep underground engineering, dynamically analyzes temperature distribution and conjugates heat transfer of indoor air and ambient-stone in underground engineering. Based on the physical geometric model of vaulted underground structures, whole-field solution method is used; controlling differential equations of the regions of solid and fluid is united; complicated coupling boundary into interior boundary is transformed. The whole numerical simulation process adopts PHOENICS (Version 3.4) to solve. At the same time we improves existing PHOENICS program to get the general experiential model for underground engineering, and provides a feasible method to solve unsteady-state conjugated heat transfer problems. Otherwise, this paper also analyzes the influence of ventilated volume and indoor heating source concretely.