Categories - CFD - wpsze

16 posts in total

CFD | Euler equations | zero viscosity | Turbulence

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

2026-01-06

CFD

#OpenFOAM #Euler equations #viscosity #Turbulence

CFD | OpenFOAM | gcc : error: unrecognized command line option ‘--showme:link’; did you mean ‘--force-link’?

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

2026-01-02

CFD

#HPC #OpenFOAM #MPI #error #intelmpi #openmpi

CFD | Turbulence model activation (use or not use)

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

2025-12-19

CFD

#HPC #OpenFOAM #turbulence model #SST k-omega

CFD | Flat Plate

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

2025-12-09

CFD

#HPC #OpenFOAM #Blasius Solution

CFD | OpenFOAM | fluentMeshToFoam .msh to openfoam

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

2025-01-15

CFD

#HPC #OpenFOAM #fluent #mesh

CFD | Boussinesq approximation (buoyancy)

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

2025-01-03

CFD

#HPC #OpenFOAM

CFD | DNS

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

2024-12-23

CFD

#HPC #OpenFOAM

CFD | Wall Function

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

2024-12-18

CFD

#HPC #OpenFOAM

CFD | RANS vs. URANS vs. LES

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

2024-12-18

CFD

#HPC #OpenFOAM

CFD | OpenFOAM | STL file | 網格生成

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

2024-12-05

CFD

#HPC #OpenFOAM

CFD | OpenFOAM | In parallel

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

2024-12-04

CFD

#HPC #OpenFOAM

CFD | OpenFOAM | Notes/Blogs

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

2024-12-04

CFD

#HPC #OpenFOAM

CFD | OpenFOAM | Allrun

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

2024-12-03

CFD

#HPC #OpenFOAM

CFD | SIMPLE 算法

CFD | SIMPLE 算法

不可壓縮 Navier-Stokes 方程對於不可壓縮Navier-Stokes方程，可以表示為：動量方程： \[ \rho \frac{\partial \mathbf{u}}{\partial t} + \rho (\mathbf{u} \cdot \nabla) \mathbf{u} = -\nabla p + \mu \nabla^2 \mathbf{u} + \mathbf{f} \

2024-11-26

CFD

#HPC #OpenFOAM

CFD | OpenFOAM Installation

CFD | OpenFOAM Installation

OpenFOAM OpenFOAM是一個CFD軟體。它包括一系列應用程序，這些應用程式在CFD中執行一系列任務。應用程式主要分為兩類：link 求解器，用於執行CFD計算；以及實現上述任務的其他程序；在OpenFOAM-11之前，每個流動類型都需要呼叫特定的求解器。由於流動類型非常多，OpenFOAM層包含了近100個解算器。像simpleFoam和pimpleFoam這樣的求解器自上世紀

2024-11-20

CFD

#HPC #OpenFOAM

CFD | Incompressible and Compressible

CFD | Incompressible and Compressible

Governing Equations The equations that govern the fluid flow are based on the conservation laws of a fluid’s physical properties. The basic equations are the three laws of conservation1: Conservation

2024-11-15

CFD