RTMsim
RTMsim: A focused, free RTM filling solver for teams working with composite preforms. Ranked #42 of 89 in Physics Simulation Software by our editors (4.8/10); pricing: Free plan; best for manufacturing teams simulating resin-transfer molding.
At a glance
- Editor score4.8 / 10
- PricingFree plan
- Best forManufacturing teams simulating resin-transfer molding
- Free planYes
- Paid fromFree
- Delivery modeDesktop
- Facts checked24 Sep 2026
Where it wins
- Models porous preforms with thickness, porosity and directional permeability.
- Supports pressure inlets, vents and preform-region patches on triangular shell meshes.
- Offers interactive runs, restartable simulations and filling and pressure plots.
Where it doesn't
- Its scope is focused on RTM filling rather than broader physics simulation.
- The Linux GUI is experimental; the Windows GUI is also available.
- Documentation was generated in March 2023.
Our verdict on RTMsim
RTMsim is an open-source Julia module for simulating resin-transfer-moulding filling in thin-walled fiber-reinforced polymer composites. It is aimed at engineers and researchers designing or validating RTM manufacturing concepts, including manufacturing teams that need to examine how resin fills a porous preform. Its specialized purpose makes it a more natural fit for RTM work than for teams seeking a general-purpose physics simulation environment.
The solver takes triangular shell meshes representing a part’s mid-surface and lets users specify porosity, thickness and directional permeability. Pressure inlet, vent and preform-region patches define the flow setup. GUI workflows support starting, continuing and interactively running simulations, with graphical inlet-port selection; mesh and cell-set inspection plots can help examine the model. These capabilities make the tool relevant when the key task is studying resin filling and pressure in a defined composite preform, rather than modeling unrelated physical systems.
Results include filling and pressure contour plots, and saved results can be used to restart simulations. RTMsim also provides command-line and Julia API functions, with package-manager installation, alongside its desktop GUI. The Windows GUI is available, while the Linux GUI is described as experimental; documentation was generated in March 2023. Teams comfortable with a focused Julia tool and desktop workflow may find its narrow solver a fit. Those needing a broader multiphysics package or a less experimental Linux GUI should consider alternatives.
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RTMsim pricing
RTMsim fact sheet
| Free plan | Yes |
|---|---|
| Paid from | Free |
| Delivery mode | Desktop |
| Lesson library | Not verified |
| Authoring tools | Not verified |
| Assessment tools | Not verified |
| 3D visuals | Not verified |
| Offline access | Yes |
| Data export | Yes |
| Deployment | Desktop |
| Platforms | Windows, Linux |
| Support | Docs |
| Built for | Small business, Mid-market, Enterprise (editorial estimate) |
| Pricing | Free plan |
| Website | obertscheiderfhwn.github.io |
| Facts checked | 24 Sep 2026 |
Alternatives to RTMsim
- COMSOL MultiphysicsA broad desktop environment for coupled physics, engineering models, and custom simulation apps.9.4
- Ansys FluentA deep CFD and HPC environment for demanding industrial simulation work.9.3
- SimScaleA broad browser-based multiphysics platform with flexible cloud workflows and tiered access.9.1
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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