搜索结果: 16-30 共查到“知识库 计算流体力学”相关记录131条 . 查询时间(4.537 秒)
钛合金在炮口制退器上的应用
炮口制退器 计算流体动力学 有限元分析
2016/5/26
为减小炮口制退器重量，提高射击精度和密集度，对钛合金在炮口制退器上的应用进行研究。以计算流体动力学以及有限元理论为基础，综合应用计算流体力学数值仿真技术和有限元分析方法，完成了从炮口制退器炮口流场三维数值模拟到有限元分析的全过程，得出了TC4钛合金和炮钢材料下的炮口制退器应力分布和变形结果。结果表明，在满足使用条件的情况下，TC4材料的使用能够减轻炮口制退器的重量，从而可以减小其它部件的设计难度。
k-kL两方程模式是一种对湍动能积分尺度输运方程模化的新型湍流模式，具有尺度自适应模拟的特性，能够在统一的表达形式下对流动进行定常和非定常数值模拟。引入可实现性修正，在二维零压力梯度平板边界层中验证其影响，进而选择典型流动的标准算例对这一模式进行较为全面的评估。通过三维CRM翼身组合体绕流算例验证了该模式应用于工程问题的实用性，并考察了网格密度对计算精度的影响。在周期山的三维非定常计算中，k-kL...
Design of free-surface interfaces using RANS equations
Design free-surface interfaces RANS equations
2015/7/3
In this paper, the continuous adjoint methodology to compute shape sensitivities in free-surface hydrodynamic design problems (RANS governing systems) has been developed.
Convergence Acceleration of High Order Numerical Simulations using a Hybrid Spectral Di
Numerical Algorithms Computational Fluid Dynamics Spectral Di
2015/7/3
The goal of this paper is to show how numerical simulations of uid ow using high order methods for unstructured meshes can be sped up using a hybrid multigrid method. In our work we accelerate the ste...
Shape Sensitivity of Free-Surface Interfaces Using a Level Set Methodology
Shape Sensitivity Free-Surface Interfaces Level Set Methodology
2015/7/3
In this paper we develop the continuous adjoint methodology to compute shape sensitivi ties in free-surface hydrodynamic design problems using the incompressible Euler equations and the level set meth...
Computational Sports Aerodynamics of a Moving Sphere:Simulating a Ping Pong Ball in Free Flight
Computational Sports Aerodynamics Moving Sphere Simulating Ping Pong Ball Free Flight
2015/7/3
Fluid dynamics associated with many sports involving spheric shaped equipments such as tennis, golf and ping pong balls tends to be very unsteady and viscous, with occasionally transitional behaviors....
Advances in Bringing High-order Methods to Practical Applications in Computational Fluid Dynamics
Advances Bringing High-order Methods Practical Applications Computational Fluid Dynamics
2015/7/3
Following pioneering research by mathematicians such as Lax and Godunov, the early development of computational uid dynamics (CFD) between 1970 and 1995 was particularly pursued in the Aerospace Commu...
Optimization Methods in Computational Fluid Dynamics
Optimization Methods Computational Fluid Dynamics
2015/7/3
In order to set the context for aerodynamic shape optimization, the airplane design process is summarized in the following paragraphs. It can generally be divided into three phases: conceptual design,...
Computational Fluid Dynamics for Aerodynamic Design:Its Current and Future Impact
Computational Fluid Dynamics Aerodynamic Design
2015/7/2
This paper discusses the role that computational fluid dynamics plays in the design of aircraft. An overview of the design process is provided, covering some of the typical decisions that a desi...
Constrained multipoint aerodynamic shape optimization using an adjoint formulation and parallel computers
Constrained multipoint aerodynamic shape optimization adjoint formulation parallel computers
2015/7/1
An aerodynamic shape optimization method that treats the design of complex aircraft configurations subject to high fidelity CFD, geometric constraints and multiple design points is described. The desi...
The Present Status, Challenges, and Future Developments in Computational Fluid Dynamics
The Present Status Challenges Future Developments Computational Fluid Dynamics
2015/7/1
Des ite the advances that have been made, CFD is still not geing exploited as effectively as one would like in the design process. This is pad due to the long set-up and high costs, both human andlcom...
FULLY NON-LINEAR CFD TECHNIQUES FOR SHIP PERFORMANCE ANALYSIS AND DESIGN
NON-LINEAR CFD TECHNIQUES PERFORMANCE ANALYSIS DESIGN
2015/7/1
Non-oscillatory discretization methods based on the Lo-cal Extremum Diminishing principle, which were origi-nally devised for compressible flow, are applied to the free-surface evolution equation. Mor...
Optimum Aerodynamic Design Using CFD and Control Theory
Optimum Aerodynamic Design CFD Control Theory
2015/7/1
This paper describes the implementation of optimiza-tion techniques based on control theory for airfoil and wing design. The theory is applied to a system de- fined by the partial differential equatio...
Reducing numerical diffsion in interfacial gravity wave simulations
interfacial gravity wave miscible advection universal limiter TVD Boussinesq
2015/6/30
We demonstrate how the background potential energy is an excellent measure of the eective numerical diusion or antidiffusion of an advection scheme by applying several advection schemes to a standin...
Consistent discretization for simulations of flows with moving generalized curvilinear coordinates
finite-volume method scalar transport incompressible flow CWC curvilinear coordinate
2015/6/30
We develop a consistent discretization of conservative momentum and scalar transport for the numerical simulation of flow using a generalized moving curvilinear coordinate system. The formulation guar...