CFD | Rhie-Chow interpolation
Rhie-Chow Interpolation Instead of storing and updating vector velocity \(\mathbf{U}\) directly at the cell faces (a layout known as a staggered grid), modern unstructured CFD solvers like OpenFOAM pr
21 posts in total
CFD | Urban CFD | Atmospheric Boundary Layer (ABL) simulation
Wall function Wall functions act as a boundary condition on this first cell. Instead of resolving the complicated flow within the viscous sublayer directly, the software bridges the gap by using semi-
CFD | Gmsh | meshing
Gmsh Gmsh is an open source 3D finite element mesh generator with a built-in CAD engine and post-processor. Its design goal is to provide a fast, light and user-friendly meshing tool with parametric i
CFD | Direct Numerical Simulation, DNS
在計算流體力學（CFD）的最高境界——直接數值模擬 (Direct Numerical Simulation, DNS) 中，耗散率（Dissipation Rate）是衡量能量如何從大尺度渦流傳遞至微小尺度並最終轉化為熱能的核心物理量。 Direct Numerical Simulation 1. Incompressible Flow 物理表達式 (不可壓縮流)在不可壓縮流（Incompres
CFD | Video
RANS, URANS, and DES Turbulence Modeling on NACA 0012 Airfoil NACA 0012 Airfoil CFD Simulation in TCAE | RANS, URANS, DES & LES @ 40 FPS NACA 0012 CFD Simulation in TCAE | RANS, URANS, DE
CFD | Euler equations | zero viscosity | Turbulence
Non-Linear Term In Computational Fluid Dynamics (CFD), the transition from the base Navier-Stokes equations to turbulence modeling involves understanding how nonlinearity behaves and how averaging cre
CFD | OpenFOAM | gcc : error: unrecognized command line option ‘--showme:link’; did you mean ‘--force-link’?
Error Error 1 gcc: error: unrecognized command line option ‘--showme:link’; did you mean ‘--force-link’? The error message you are seeing, gcc: error: unrecognized command line option ‘--showme:link
CFD | Turbulence model activation (use or not use)
Question: When should we exclude the turbulence model? In Computational Fluid Dynamics (CFD), the decision to omit a turbulence model is usually driven by the physics of the flow or the resolution of
CFD | Flat Plate
1. Why the Flat Plate Case is Important in CFD The flat plate boundary layer problem is a cornerstone in fluid dynamics, and its study using CFD is critical for several reasons: Foundation for Bound
CFD | OpenFOAM | fluentMeshToFoam .msh to openfoam
Issue 一个可压缩超音速OpeNFOAM算例，想找个fluent大佬来设置一个 粘度： 0 湍流模型：无 二维算例，所有壁面都可以为滑移，或者零梯度边界 进口边界：静压：1e5、温度：400K、速度：1000m/s 没有其他进口；右边是出口 稳态 网格数量：10000个 OpenFOAM计算大约3秒算完。最大压力 810000 。想看一下Fluent的最大压力
CFD | Boussinesq approximation (buoyancy)
Boussinesq approximation (buoyancy) In fluid dynamics, the Boussinesq approximation is used in the field of buoyancy-driven flow (also known as natural convection). It ignores density differences exce
CFD | DNS
DNS A direct numerical simulation (DNS) is a simulation in computational fluid dynamics (CFD) in which the Navier–Stokes equations are numerically solved without any turbulence model. This means that
CFD | Wall Function
Why using wall functions approach? Nowadays turbulence models are heavily used when doing CFD simulations. However, some mature turbulence models such as $ k-$ are only valid in the area of turbulence
CFD | RANS vs. URANS vs. LES
Characteristics of turbulence One characteristic of turbulent flows is their irregularity (or randomness). A fully deterministic approach to characterize turbulent flows is very difficult. Turbulent f
CFD | OpenFOAM | STL file | 網格生成
OpenFOAM三維網格生成器 snappyHexMesh（SHM）是OpenFOAM軟體的三維結構化網格生成模組，功能比較強大，設定靈活，表面處理貼合功能非常強健並且可以並行運算。 SHM能夠透過使用者自訂參數（如細化參數castellatedMeshControls、切合參數snapControls等）對預先載入的幾何體檔案（通常為'.stl'檔案）自動實現三維網格生成、加密(castella
CFD | OpenFOAM | In parallel
Running applications in parallel Both domain decomposition and reconstruction processes can only be done on a single core. This section describes how to run OpenFOAM in paralle
CFD | OpenFOAM | Notes/Blogs
Notes/Blogs 筆記/部落格列表 CFD study and method development for air intake systems using OpenFOAM 2020 | GIOVANNI CALZOLARI KTH ROYAL INSTITUTE OF TECHNOLOGY SCHOOL OF ENGINEERING SCIENCES Urban Wind Flo
CFD | OpenFOAM | Allrun
Allrun All OpenFOAM tutorials have Allrun and Allclean scripts which call some mysterious RunFunctions from even more mysterious sources. Source OpenFOAM first, source /home/wpsze/openfoa