稳定温度分层流的数值模拟与实验研究

温度分层流是一种常见的自然现象,准确模拟海洋环境中的稳定温度分层流动具有重要的理论和实际应用价值。建立了描述温度分层流运动的质量、动量和能量守恒方程,采用改进型的k-ε湍流模型模拟分层流运动的流动与传热强耦合过程。运用有限体积法,使用滑移壁面、给定壁面温度函数与来流温度函数相结合的方法,对现有温度分层模拟方法进行了改进,实现了垂直方向上任意温度曲线的分层流温度场的稳定数值模拟。采用辐射加热灯加热水槽流体表面,形成了流体的温度分层。通过与分层流水槽模型试验的对比,证明了该方法的可行性与准确性。

Numerical simulation with the experiment for stable temperature stratified flow

The temperature stratified flow is a common phenomenon in nature, there are important theoretical and practical applications for the accurate simulation of stably temperature stratified flow in the marine environment. In this paper, the mass, momentum and energy conservation equations of temperature stratified flow are built up. The strong coupling process of heat transfer with the stratified flow is simulated using the turbulent flow model of modified k - epsilon. Using the finite volume method and combining the slip surface function, the given wall temperature with the incoming flow temperature function, the existing simulation method of temperature stratified flow is improved. The stable temperature stratified flow with the arbitrary temperature curve in vertical direction of flow is realized using the numerical simulation. The thermal stratification of the fluid is formed after heating the fluid surface in tank by radiation heating lamp. By contrast with the experimental result of stratified flow in water tank the availability and accuracy of the simulating method of temperature stratified flow are validated.