yPlusStats

TL;DR: Do not write a volScalarField every time the yPlus function object is called.

Requirements

• git
• OpenFOAM v1906+

Rationale

When calculating y+, OpenFOAM generates two outputs: one containing the min, max, and average values on each patch for each time the yPlus function is called; and a second one storing the y+ for the entire domain as a volScalarField. This code disables the second output, which may be of the interest for some users.

The problem of writing a y+ volScalarField arises when one uses purgeWrite or a writeInterval different from the one in system/controlDict. In these cases, OpenFOAM creates various time folders containing only the y+ volScalarField, which may lead to the following problems:

• The total number of folders in one's simulation can rapidly increase. In some cases, using tiny time steps and a large amount of subdomains can exponentially grow the number of folders created. And thus, the simulation may reach some sort of limit that prohibits writing to disk.

• If the write interval for the y+ is different from the one for other flow variables, restarting the simulation may require the user to manually delete some time folders in which only the y+ volScalarField is stored.

Install

1. Load the OpenFOAM environment.

2. Create the user source folder.

mkdir -p ${FOAM_RUN}/../src

3. Clone the repository

cd ${FOAM_RUN}/../src
git clone https://github.com/gabrielbdsantos/yPlusStats
cd yPlusStats

4. Compile the library.

wmake all

Disclaimer and License

The code is not approved or endorsed by OpenCFD Ltd., the producer of the OpenFOAM software and owner of the OprenFOAM and OpenCFD trade marks. Any implementations presented here are bound to the same license as OpenFOAM: the GNU Public License v3. See the LICENSE for more information.