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OpenFOAM VS Calculix

Compare OpenFOAM VS Calculix and see what are their differences

OpenFOAM logo OpenFOAM

OpenFOAM® - Official home of The Open Source Computational Fluid Dynamics (CFD) Toolbox.

Calculix logo Calculix

Calculix is a free and open-source finite-element analysis application that uses an input format...
  • OpenFOAM Landing page
    Landing page //
    2021-08-02
  • Calculix Landing page
    Landing page //
    2022-10-23

OpenFOAM features and specs

  • Open Source
    OpenFOAM is free to use and its source code is openly available under the GPL license, allowing for extensive customization and transparency in computational fluid dynamics (CFD) simulations.
  • Extensibility
    Users can extend and modify the functionality of OpenFOAM to suit specific needs or integrate new algorithms, making it highly adaptable to various projects and research requirements.
  • Community and Support
    A robust community of users and developers contributes to forums, documentation, and collaboration, providing substantial peer support and shared knowledge.
  • Versatility
    OpenFOAM supports a wide range of physical models and simulation types, from simple incompressible flow to complex multiphase flows and chemical reactions, making it suitable for diverse applications.
  • Parallel Computing
    Optimized for parallel processing, OpenFOAM can run efficiently on high-performance computing systems, thereby handling large-scale simulations effectively.

Possible disadvantages of OpenFOAM

  • Steep Learning Curve
    OpenFOAM requires a significant investment of time to learn and master, as it involves understanding complex physics, programming concepts, and software-specific syntaxes.
  • Limited GUI
    Unlike some commercial CFD software, OpenFOAM lacks a sophisticated graphical user interface (GUI), necessitating users to rely on command-line input and scripting for setup and execution of simulations.
  • Documentation Quality
    Although community-driven, the documentation can sometimes be incomplete or outdated, making it challenging for new users to find reliable and up-to-date instructions and tutorials.
  • Performance Variation
    Performance and stability can vary depending on the specific simulation setup and hardware used, which may require users to conduct extensive testing and optimization.
  • Dependency Management
    Installing and maintaining OpenFOAM and its dependencies can be complex, often requiring specific versions of libraries and compilers to ensure compatibility and optimal performance.

Calculix features and specs

  • Open Source
    CalculiX is open-source software, meaning it is free to use and can be customized to meet specific user needs. Users can access and modify the source code, promoting transparency and flexibility.
  • Extensive Documentation
    The software comes with comprehensive manuals and user guides, which can be helpful for beginners to apply the software effectively and understand its various features.
  • High Compatibility
    CalculiX is compatible with several operating systems and integrates well with other open-source tools, offering versatility in different computing environments.
  • Robust Solving Capabilities
    It offers powerful finite element analysis (FEA) capabilities, including thermal, static, and dynamic analyses, which can handle complex structural problems efficiently.
  • Active Community Support
    There is an active online community and forums where users can share experiences, seek help, and collaborate on improvements to the software.

Possible disadvantages of Calculix

  • Steep Learning Curve
    For users without a background in finite element analysis or software programming, the learning curve can be quite steep, as the interface is less intuitive compared to commercial FEA tools.
  • Limited Graphical User Interface (GUI)
    CalculiX lacks a full-featured GUI, which may require users to rely on command-line inputs or additional third-party software for pre- and post-processing tasks.
  • Resource Intensive
    The software can be resource-intensive, requiring significant computational resources for large-scale simulations, which might limit usage on less powerful hardware.
  • Limited Marketing and Awareness
    Being open-source, the project lacks the marketing and visibility of commercial counterparts, which may result in less documentation for niche applications or newer updates.
  • Complex Installation Process
    The installation procedure can be complicated, especially for users who are not familiar with compiling software from source, posing a barrier to entry for some potential users.

OpenFOAM videos

What is OpenFoam? | Skill-Lync

More videos:

  • Tutorial - How to run your first simulation in OpenFOAM® - Part 1 - tutorial
  • Tutorial - CFD tutorial for beginners | What is OpenFOAM? | SKILL-LYNC

Calculix videos

Mecway / Calculix - simple check and review results

More videos:

  • Review - CalculiX - Swivel Tie Down Ring (w plastic)

Category Popularity

0-100% (relative to OpenFOAM and Calculix)
Numerical Computation
86 86%
14% 14
Technical Computing
86 86%
14% 14
Simulation Software
100 100%
0% 0
CFD
71 71%
29% 29

User comments

Share your experience with using OpenFOAM and Calculix. For example, how are they different and which one is better?
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Social recommendations and mentions

Based on our record, OpenFOAM seems to be a lot more popular than Calculix. While we know about 19 links to OpenFOAM, we've tracked only 1 mention of Calculix. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.

OpenFOAM mentions (19)

  • OpenFOAM on Debian 12
    In openfoam.org, there is not compiled binaries for Debian (any version). So one should install it using docker (I prefer to do not use it) or by compiling the code from the source. I consider compiling from source, but I do prefer binaries. Source: almost 2 years ago
  • Please help me get running OpenFOAM
    Hello I am a mechanical engineering student in my last year. So I made the wisest decision to learn OpenFOAM. But there is the catch. I have no idea how to use Linux or how to emulate Linux on Windows 10. I found a lot of videos on Youtube how to download an start OpenFOAM but every one of them was using different methods each time so I got confused. Can anyone please help or direct me? Thank you for your answers... Source: about 2 years ago
  • Step by Step (Written not Video) Tutorial for FEM with Air
    As far as air flow simulation, I got slightly farther with Open Foam than I did in FreeCAD directly. Still, I got in way over my skill level and stopped before getting anything useful. Source: about 2 years ago
  • Open source FEA tools instead of ANSYS Workbench and APDL
    There are two versions of openfoam, one closed source (which is the one I linked to in my original comment, my apologies about that) and the open source version. But what you're describing makes it sound like fenics might be your best option. Source: over 2 years ago
  • command not found and looping
    I suggest you install per the instructions at openfoam.com or openfoam.org instead of using apt. Source: over 2 years ago
View more

Calculix mentions (1)

  • What is the model used for nonlinear material in Freecad?
    Under the hood CalculiX is used for this. It appears the FreeCAD nonlinear material object does use a plastic model from CalculiX. Here are two forum threads I found discussing the matter:. Source: about 4 years ago

What are some alternatives?

When comparing OpenFOAM and Calculix, you can also consider the following products

ANSYS Fluent - ANSYS engineering simulation and 3D design software delivers product modeling solutions with unmatched scalability and a comprehensive multiphysics foundation.

elmer - Elmer is an open-source software package that solves partial differential equations. Combined with its ability to run various equations in parallel, it is an effective tool for running multiphysical simulations. Read more about elmer.

MATLAB - A high-level language and interactive environment for numerical computation, visualization, and programming

COMSOL Multiphysics - COMSOL is the developer of COMSOL Multiphysics software, an interactive environment for modeling and simulating scientific and engineering problems.

Wolfram Mathematica - Mathematica has characterized the cutting edge in specialized processing—and gave the chief calculation environment to a large number of pioneers, instructors, understudies, and others around the globe.

Code_Saturne - Code_Saturne solves the Navier-Stokes equations for 2D, 2D-axisymmetric and 3D flows, steady or...