Now on the Snap Store — Linux

Structured Mesh Editor
for OpenFOAM

Design high-quality structured hex meshes interactively. Load STL geometry, manipulate blocks in 3D, control grading and cell counts, then export directly to blockMeshDict.

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30-day free trial · No credit card required

SimOnMesh — blockMesh

$ sudo snap install sim-on-mesh

✓ sim-on-mesh 1.2 installed

$ sim-on-mesh

Loading geometry engine...

✓ Ready

Features

Everything you need to mesh a blade

A native desktop app built on VTK and FLTK — fast, offline, no browser required.

🧊

Interactive 3D Viewport

Rotate, pan, and zoom your hex mesh in real time. Select vertices, edges, and faces directly in the 3D view.

📐

STL Geometry Loading

Import STL surfaces as reference geometry. Project block faces, edges, and vertices onto curved surfaces automatically.

✂️

Block Split & Extrude

Split blocks along any direction at an arbitrary fraction. Extrude faces outward to grow the mesh layer by layer.

⭕

O-Grid Generation

Wrap an O-grid ring around selected faces with one operation — ideal for cylindrical and blade geometries.

📊

Edge Grading Control

Set cell counts and expansion ratios per edge direction. Grading propagates consistently across all linked blocks.

📁

blockMeshDict & polyMesh Export

Write a valid OpenFOAM blockMeshDict or run the full block mesh pipeline and export a polyMesh directory.

🔁

Undo Support

Single-step undo for all topology operations — split, extrude, O-grid, merge, and delete.

🏷️

Boundary Patch Assignment

Tag block faces with named boundary patches (inlet, outlet, wall, symmetry) ready for OpenFOAM boundary conditions.

🖥️

Native Linux App

Distributed as a Snap package — install in seconds, runs offline, hardware-accelerated via your system GPU driver.

Workflow

From geometry to mesh in minutes

Sim-on-Mesh fits into a clean pre-processing workflow for OpenFOAM CFD simulations.

Load Geometry

Import your blade or component as an STL file. The geometry appears in the 3D viewport as a reference surface.

Build the Block Structure

Create the initial block, then split, extrude, and delete blocks to match the topology of your geometry.

Project & Grade

Project block faces onto the STL surface. Set grading and cell counts for boundary layer resolution.

Export to OpenFOAM

Save a blockMeshDict or run the full pipeline to get a polyMesh ready for simpleFoam or pimpleFoam.

Gallery

Software in Action

Explore the Sim-on-Mesh interface and core features.

Watch step-by-step tutorials on YouTube →

Surface Integration

Interactive 3D viewport with hardware-accelerated STL rendering.

Topology Management

Visual block manipulation with real-time feedback and undo support.

Hex Mesh Output

Full control over edge grading and cell distribution before export.

O-Grid Topology

Wrap blocks around curved geometry using the O-grid pattern for boundary layer meshes.

Pricing

Subscription

Full-featured access for professionals and teams.

Monthly Plan

Professional License

^$19/month

billed monthly · cancel anytime

Full access to all block mesh operations
STL geometry loading & surface projection
O-Grid, split, extrude, merge tools
Edge grading & cell count control
blockMeshDict & polyMesh export
Continuous updates while active
Email support

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Linux

The primary platform for OpenFOAM users. Install via the official Snap Store.

Terminal installation:

$ sudo snap install sim-on-mesh

Or download as AppImage (no install required):

↓ SimOnMesh-1.4.3-x86_64.AppImage

$ chmod +x SimOnMesh-1.4.3-x86_64.AppImage
$ ./SimOnMesh-1.4.3-x86_64.AppImage

Windows

Native application for Windows 10 & 11.

Download for Windows:

↓ SimOnMesh-win-x64.zip

Installation:

1. Extract the .zip archive
2. Run SimOnMesh.exe

If the app fails to launch

Install the Visual C++ Redistributable 2022 (x64) from Microsoft and try again.

↓ vc_redist.x64.exe

Minimum Requirements

✓ Linux x86_64 (Ubuntu 20.04+, Fedora...)
✓ Windows 10/11
✓ OpenGL 3.3+ GPU driver
✓ 4GB RAM minimum

Structured Mesh Editor
for OpenFOAM