PyroSim was designed to complement the Fire Dynamics Simulator (FDS) developed by NIST in the US. With state-of-the-art fire research facilities and personnel, they understand the calculations of fire simulation better than anyone. FDS is the engine powering fire simulations all over the world. PyroSim empowers more engineers to use this technology and elevates its capabilities. 1. PyroSim provides graphical tools which automatically generate the text-only FDS input file. 2. PyroSim imports CAD, enables advanced simulation management, and packages its own results manager. None of this is possible without FDS empowering car park jet fan simulations, sprinkler activation studies, and more. FDS is free for anyone to download. Do you need PyroSim? We think so. Consider the time not spent constructing your building geometry from scratch in a text editor. Consider the errors caught in real-time and brought to your attention. Thunderhead Engineering supports you every step of the way. Whether you want in-depth training or self-taught materials, you can learn performance-based design modeling with greater efficiency and proficiency. We design our software for anyone to learn, and our customers are delighted when our support team helps them succeed.
What's new in 25.1.0826
What's New This release adds a new Mesh Refinement Zones feature and a flurry of User Experience Improvements. This version of PyroSim is designed for FDS version 6.10.1 and uses version 21.0.2+13 of the OpenJDK Java VM. Mesh Refinement Zones This release of PyroSim provides a powerful new feature to increase the fidelity and speed of your simulations. When working with FDS models, it is often useful to create meshes with different cell resolutions. Creating fine resolution meshes around areas of high volatility, such as around a fast-growth fire source, provides a higher level of detail to the calculations. However, using a fine mesh throughout the entire model would cause the simulation to take much longer than necessary. In this scenario, the best approach is to create a fine local mesh around the volatile area, then use coarser meshes throughout the rest of the model. This process however, is very tedious. Multiple meshes need to be created, and the meshes must all be aligned to a tight tolerance to ensure that the FDS calculations align properly. Additionally, if resolution changes are made to any of the meshes, the entire set of meshes needs to be realigned. This is where Mesh Refinement Zones come in. Mesh Refinement Zones allow you to specify areas inside your meshes that you would like to have a higher cell resolution. Mesh Refinement Zones can apply a 2x or 4x level of refinement compared to the surrounding Mesh. Once specified, PyroSim takes care of the rest. Creating a Mesh Refinement Zone in PyroSim 2025.1. This feature also works with 'Scenarios' in PyroSim, allowing you to have different mesh configurations based on different refinement zones for each scenario. Imagine a situation where there are different design fires in different locations for each scenario. Refinement zones can be used to refine the mesh around the fires in each scenario, without manually creating and enabling/disabling those meshes for each one. You can also just use Refinement Zones as a tool to generate a starting set of meshes that you can refine further as needed, with the 'Apply Refinements' feature. PyroSim will convert the refinement zone into a mesh and generate all surrounding meshes explicitly in the Object Tree. From there, you can then modify those meshes and even add new refinement zones to them as needed. Applying a Mesh Refinement Zone in PyroSim 2025.1. You can read about these changes in the Mesh Refinement Zones section of the PyroSim User Manual. …
PyroSim 2025 can open or be associated with 4 file types:
.pfr.psm.smv.smvv
PyroSim 2025 version history
25.1.0728
What's New This release adds a new Mesh Refinement Zones feature and a flurry of User Experience Improvements. This version of PyroSim is designed for FDS version 6.10.1 and uses version 21.0.2+13 of the OpenJDK Java VM. Mesh Refinement Zones This release of PyroSim provides a powerful new feature to increase the fidelity and speed of your simulations. When working with FDS models, it is often useful to create meshes with different cell resolutions. Creating fine resolution meshes around areas of high volatility, such as around a fast-growth fire source, provides a higher level of detail to the calculations. However, using a fine mesh throughout the entire model would cause the simulation to take much longer than necessary. In this scenario, the best approach is to create a fine local mesh around the volatile area, then use coarser meshes throughout the rest of the model. This process however, is very tedious. Multiple meshes need to be created, and the meshes must all be aligned to a tight tolerance to ensure that the FDS calculations align properly. Additionally, if resolution changes are made to any of the meshes, the entire set of meshes needs to be realigned. This is where Mesh Refinement Zones come in. Mesh Refinement Zones allow you to specify areas inside your meshes that you would like to have a higher cell resolution. Mesh Refinement Zones can apply a 2x or 4x level of refinement compared to the surrounding Mesh. Once specified, PyroSim takes care of the rest. …
Frequently asked questions
Is PyroSim 2025 free?
PyroSim 2025 is proprietary software from Thunderhead Engineering. Check the publisher's license terms for pricing and usage rights.
What is the latest version of PyroSim 2025?
The latest version is 25.1.0826.
Is it safe to download PyroSim 2025?
The download button links to the official installer published on thunderheadeng.net, the same file Windows Package Manager installs. You can verify the downloaded file by comparing its SHA-256 checksum with 165e7c4032c09cdd54ae450e07567a7abb9fb0b4ca66e036cf3fcdfeb663e5aa.
Which Windows versions does PyroSim 2025 support?
PyroSim 2025 runs on Windows and is available for 64-bit (x64) systems.
How do I install PyroSim 2025 silently?
Run the offline installer with msiexec /i "PyroSim-2025-1-0826-x64-en.msi" /quiet /norestart, or install it with Windows Package Manager: winget install --id=Thunderhead.PyroSim.2025 -e --silent.
How do I uninstall PyroSim 2025?
Open Settings › Apps › Installed apps, find PyroSim 2025 and select Uninstall. From the command line, run winget uninstall --id=Thunderhead.PyroSim.2025 -e.
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