I wish you Happy Holidays and a wonderful 2025!
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How to quickly export points for a timeVaryingFixedValue boundary in OpenFOAM
The timeVaryingFixedValue boundary in OpenFOAM allows data extracted from other simulations or experimental data to be mapped to be used as boundary condition. The boundary requires a directory structure containing the data to be set up as follows: caseName 0 constant boundaryData/<boundaryName> TimeFolder0 TimeFolder1 points system The points file contains the coordinates of the points used to perform the data mapping. If data originate from another boundary conditions (e.g., the outlet of another simulation), it is straightforward to automatically generate such file. Let us assume, for convenience, that the field p needs to be patched, and that the original simulation was executed with pimpleFoam. To extract the values of p…
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CFD simulations on Azure Batch – Part 5
The last post of this series focused on setting up a pool of compute nodes on Azure Batch. In this part I show how to add jobs to a pool and then how to add tasks to a job. To summarize the nomenclature: a task is, in the context of CFD, a simulation, a job is a set of simulations. It is possible to configure jobs directly from the portal by selecting Jobs in the side bar, and clicking on the “+Add” button: This will open the “Add job” screen: where we have to select: The job id, following the rules indicated in the figure The pool (click and select…
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CFD simulations on Azure Batch – Part 4
Part 3 of this series focused on creating a file share in Azure Storage to be used with Azure Batch. In this part, I will show how to setup a pool of compute node. This can be achieved using both the Azure Portal and the C# or Python API. I will show how to do so using the portal in general, since it may be useful to be familiar with the portal for simple use cases. Then I will provide a summary of the key instructions of the C# API to achieve the same tasks with a few lines of code, and a brief description of how to use the…
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CFD simulations on Azure Batch – Part 3
The first two parts of this series were dedicated to preparing a case to be executed without intervention and to install some useful tools to simplify operations with Azure Storage and Azure Batch. In part 3 I discuss the setup of an Azure Storage account and create a file share that we will use with Azure Batch. Create an Azure Storage account The first step consists in creating an Azure Storage account. To do so, click on the search bar at the top of your Azure account page and type “storage”: Select “Storage accounts”, which leads to the screen: In this screen, click on “+Create”. The following page will open:…
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CFD simulations on Azure Batch – Part 2
In the first part of this series of blog posts, I showed how to configure an OpenFOAM® case to be executed automatically through a bash script. The script allows the case to be restarted at need, without repeating steps of the case setup that were executed the first time it was executed. Before proceeding with the configuration of Azure Batch, I recommend the installation of two tools provided by Azure: Azure Storage Explorer Batch Explorer Both tools are available for Windows®, Linux® and mac®, so their use is not restricting to a specific operating system. I also recommend installing an SSH client: all the main operating systems currently provide one,…
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Extended second-order moment advection scheme
I made the OpenQBMM implementation of the second-order realizable zeta scheme for moment advection more general. The previous implementation [2] was specific for moments of distributions supported over the positive real line, making the implementation of the scheme not suitable for moments of distributions with compact support, such as the PDF of the mixture fraction used in turbulent mixing and combustion models. However, the original paper of Nguyen and Laurent [1] proposes a straightforward extension to the case of compact support, which is now made available in OpenQBMM. For simplicity, the implementation considers only the support [0, 1], without loss of generality. The implementation is currently available in the development-openfoam.com…
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Thank you Another Fine Mesh for the mention!
Many thanks to John Chawner for the mention in Another Fine Mesh (Reading section).
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Bye bye social media. For good, this time.
Some time ago, I took a break from social media and then gave them another try. Today I deleted my account on the only generalist social medium I have consistently used. Social media have proven to be excessively powerful tools, out of the control of governments, institutions, people who use them. They have not been sufficiently regulated, have dodged rules some governments have long tried to impose on them, and have become, also thanks to their slow response and inaction, a mean of dissemination of ideas that are far from positive and constructive, as recent events have shown, not for the first time. It has been interesting to request my…
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P. 2. The structure of dictionaries (Ep. 1)
Dictionaries are what OpenFOAM® uses as input files, but the same name is used to indicate some of the structures inside such files. In this part a general overview of their structure is provided.