座艙空氣非定常流動特征及數值模擬策略2012年研究進展報告

何楓++姚朝暉++張錫文++劉正先

摘 要：對Re數不高的熱對流流場，目前流場CFD數值模擬策略主要采用大渦模擬和時均湍流模式兩種方法。在進行大渦數值模擬時，其中亞格子模式分別采用Smagorinsky-Lilly模式、壁面自適應當地渦粘模式、Smagorinsky-Lilly動力亞格子模式、Vreman的亞格子模式，主要對比各種亞格子模式在計算熱對流時的優勢和差異。進行時均湍流模式數值模擬時，采用各種湍流模式，對比計算差異，并與LES對比，確定對熱對流湍流信息的抑制程度，為今后改進湍流模式奠定基礎。在熱對流的數值模擬中，網格技術也是關鍵，采用根據初算結果，調整網格密度分布技術，加快計算收斂。根據檢測固定點參數的變化以及熱通量平衡狀態，判定計算是否收斂。實驗分別采用激光粒子測速、熱線進行速度測量，采用熱電偶測量溫度，校正CFD計算結果。

關鍵詞：熱對流 湍流 數值模擬

Progress Report of 2012

He Feng1 Yao Chaohui1 Zhang Xiwen1 Liu Zhengxian2

（1.Tsinghua University； 2.Tianjin University）

Abstract：Currently，the solution strategies for not high Re number convection is large eddy simulation method and RANS with turbulent models method. For the LES method， various sub-grid scale models are used， such as Smagorinsky- Lilly model， Lillys dynamic Smagorinsky model Vremans model and wall-adapting local eddy-viscosity model， to compare the difference and the applicability for convection flow field. The simulation data with the turbulent models are compared with the experimental data and LES data in order to determine that how much turbulent information is restrained by the method of turbulent models. Grid technique also play key role for simulation convergence. Adjusting grid density and monitoring surface variables and the balance of the heat transfer flux can help to reach the simulation convergence. Some related experiments are done by the particle image velocimetry （PIV） and hot wire technology.

Key Words：Convective flow； Turbulence； Numerical simulation