CFD Online Discussion Forums

Closing on wall functions - part 2: the iterative procedure

Posted April 23, 2022 at 06:39 by sbaffini (NuTBox)
Updated May 14, 2022 at 17:30 by sbaffini

The first step in the wall function approach delineated in the first post of this series requires determining $\tau_w$ from

$\tau_w = \frac{\left[\left(U_p - U_w\right) \left(\frac{\mu}{y_p}\right) - y_p\sum_{i=0}^{N}\frac{F_U^i}{i+1}\left(\frac{{s_U^i}^+}{{y^+}^{i+2}}\right)\bigg\rvert_{y_p^+} \right]}{\left(\frac{{s_U^{-1}}^+}{y^+}\right)\bigg\rvert_{y_p^+}}$

with analogous steps also required for the temperature and scalars. If one has a mean to univocally/externally...

sbaffini

Senior Member

Posted in Uncategorized

Views 711 Comments 0 sbaffini is offline

Closing on wall functions - part 1: Problem statement and general solution

Posted April 23, 2022 at 06:36 by sbaffini (NuTBox)
Updated May 14, 2022 at 17:55 by sbaffini

This is the last series of posts on wall functions, where I summarize previous findings and give them a broader context. I won't provide derivations (hopefully I'll have time to put this in a larger note), but just few statements with the proper scripts to test them.

This all started with the aim to solve the following problem:

$\frac{d}{dy}\left[C_p\left(\frac{\mu}{Pr}+\frac{\mu_t}{Pr_t}\right)\frac{dT}{dy}\right]=F_T$

with boundary conditions...

sbaffini

Senior Member

Posted in Uncategorized

Views 847 Comments 0 sbaffini is offline

CFD Blog (1): OpenFOAM small bits: How to compile new solver

Posted December 27, 2021 at 12:42 by Ash Kot

Tags compilation, openfoam, openfoam programming，c++, solver, wmake

Hello Engineers and Scientists,

Preamble:
(If this is your first time then you may like read it, or you can skip it if it’s not your first time)

Being involved in CFD engineering and development/programming, I decided to dedicate some of the learning to community by writing through blog towards new budding CFD developers and engineers. So that new people don’t have to start from scratch. In this blog series, I shall try to create link to connect my files over...

Ash Kot

Member

Posted in Uncategorized

Views 951 Comments 0 Ash Kot is offline

CFD Post Expression over time chart (without monitor point)

Posted December 9, 2021 at 06:58 by oakin

So easy solution for time dependent analysis charts.

Quote:

Originally Posted by Badi

well I found it out. Just for everyone whoever finds it.

1. Make the Expression you want. (e.g. volumeInt(vapour.Volume Fraction)@Default Domain)

2. Make a chart and tick the transient box => location: Expression

3. Take the x-axis time and y-axis with the variable from your expression

4. click apply and see your expression over time chart

oakin

New Member

Posted in Uncategorized

Views 734 Comments 0 oakin is offline

2D_Panel-CFD v0.0.1 Release

Posted December 8, 2021 at 05:06 by Fluidentity13

Tags new solver, open source, simple, steady, steaggered

General Background

The project has been started as an Open Source repository for CFD solvers. The motive is to provide handy easy to understand code with multitude of CFD schemes for CFD developers. Also, it needs to remain functional as an easy to setup open source solver for users. This release only comprises of a terminal sequential prompt, simple and effective. We have immediate plans of implementing a PyQT GUI to it.

GITHUB

Code:

git clone https://github.com/Fluidentity/2D_Panel-CFD

...

Fluidentity13

New Member

Posted in Uncategorized

Views 807 Comments 0 Fluidentity13 is offline