SBIR PHASE I: Non-Gradient Transport Model for Variable Density Fluid Turbulence

该小型企业创新研究（SBIR）第一阶段项目旨在开发比目前在变密度流体流动的CFD模拟中常用的更精确的湍流传输模型。第一阶段项目的创新将是一个新的、部分验证的模型，该模型将是流行的K/K湍流模型的扩展，并将明确纳入非梯度输运项。第一阶段的研究将包括开发一种数值方法，用于模型方程的有效计算机求解，并将包括通过将数值解与一维几何形状的实验进行比较来进行验证。这项创新将为计算流体动力学软件带来一种重要的新能力，因为它将提高变密度湍流的计算精度，从而在工程应用中获得比目前可用的CFD软件更可靠的结果和更好的设计指导。 计算流体动力学正越来越多地被用作内燃机设计的辅助手段，由于计算流体动力学预测的可靠性提高，这一创新将降低研究和设计成本，并使内燃机设计得更好。该创新的其他应用是燃气涡轮机发动机、工业炉、发电系统和高速推进装置中的流动

This Small Business Innovation Research (SBIR) Phase I project aims to develop more accurate turbulence transport models than are currently in common use in CFD simulations of variable-density fluid flows. The innovation of this Phase I project will be a new, partially validated model that will be an extension of the popular K/epsilon turbulence model and will explicitly incorporate non-gradient transport terms. Phase I research will include the development of a numerical methodology for efficient computer solution of the model equations, and will include validation through comparisons of numerical solutions with experiments in one-dimensional geometries.The innovation will bring a significant new capability to CFD software because it will improve the accuracy of calculations of variable density turbulent flows, resulting in more reliable results and better design guidance in engineering applications than with currently available CFD software. CFD is increasingly being used as an aid in designing IC engines, and the innovation will result in lower research and design costs and better designed IC engines because of the improved reliability of CFD predictions. Other applications of the innovation are to flows in gas turbine engines, industrial furnaces, electric-power generating systems, and high-speed propulsion devices