Highlights: faster 3D, better GUI
- Ability to load geometry with any number of triangles.
- Spatial acceleration
- Accelerated generation of boundary conditions for large meshes, improvement of >15% per time step.
- Accelerated detection of points/walls collision for large time steps
- Other geometrical manipulation is accelerated as well
- Automatic initialisation of domain boundaries, based on bounds of input geometry.
- Linear solvers are faster due to allocating solving memory only once.
- Syntax highlighting for simulation input. Easier to write, and find errors if any.
- Set free-slip boundary condition through boundary condition or coefficient as fluid property.
- Fixed input and viscosity bugs for non-Newtonian models.
- Option to render fluid points on top of the geometry, convenient for tanks/containers.
- Slice operation shows the plane origin and normal when editing its parameters.
- Added help about GUI, button in the application and a page on the website.
- Due to the above, i.e. large rewrite, solver may be unstable before the next update.
Highlights: 3D, non-Newtonian models
- Added non-Newtonian models:
- Power Law
- Cross-Power Law
- Improved stability of the implicit velocity solver for flow near free surface.
- Added 2nd order backward differencing (BDF2) for the implicit velocity solver. Only 1st order was available until now.
- Added initial algorithm for dynamic (automatic) time stepping.
- The solver now runs 3D problems in real-time.
- Added the free-slip boundary condition.
- Made the first round of optimizations in 3D collision detection of fluid and geometry.
- GUI is upgraded with icon labels and 3D geometry rendering.
- 3D camera zoom bugs are fixed.
Highlights: Windows, implicit velocity solver, surface tension
- Pressure gradient limiter to stabilise non smooth pressure fields.
- Stabilised/improved source term for the pressure Poisson equation.
- Implicit solution to the velocity with Jacobi solver and BDF1, stable high viscosities.
- Improved Jacobi solver performance by average value of 7%.
- Explicit curvature estimation at the free surface.
- Surface tension force through pressure Dirichled b.c. (using curvature and Laplace jump).
- Windows CPU support. GPU yields strange driver errors not experienced on Linux.
- The domain acceleration may be imposed through timeline of positions, velocities or accelerations.
- Fluid can be initialised in separate spaces by specifying multiple sources of flooding.
- Added real-time colourisation by point’s IDs.
- Added real-time colourisation of free-surface points.
- Rendering of too fast simulations is limited to 60 FPS, to avoid losing performance on CUDA -> OpenGL transfer.
- Added and tested Mohr-Coulomb non-Newtonian model.
- Made research license a bit more flexible.
Highlights: GPU, FEM, moving bodies
- Enabled CUDA backend to run simulations on the GPU.
- The movement of bodies may be imposed through timeline/keyframes of positions or velocities.
- Smooth interpolation of imposed movement of bodies in time, using Piecewise Cubic Hermite Interpolating Polynomial (PCHIP).
- Imposed body oscillations (along vector, or rotating along axis) are superposed to the movement, by using “impose_oscillation” input.
- No more triangle soups, meshes now use connectivity information. This enables deformations, and easy orientation transformation.
- Import surface meshes from OBJ, OFF or STL file formats. For STL (triangle soup) file format, connectivity is built upon loading.
- Warning message is shown for users that have a too old GPU, that cannot view results in real-time.
- Fluid-structure interaction using preCICE. Rhoxyz can be coupled with an external FEM solver. Tested using CalculiX solver.
- Bodies marked using: “output_force”: true, export resultant force and torque acting on the body to a CSV file, each time step.
Highlights: Initial public version