Simulation Software for Fluids and SolidsSimulation Flushing Toilet
The simulation of the water flow in a flushing toilet can be performed using the CFD software NOGRID points. Based on a geometric model - either be imported from your CAD or created with our CAD preprocessor COMPASS - you can quickly generate a computational model of a specific geometry. Compared to mesh-based methods, this significantly reduces setup time and allows you to analyze the flow behavior in advance.
In the case study, the toilet is initially empty and gradually fills with water. As shown in Figures 3 and 4, the water forms a thin free-surface film that begins to break up into smaller fragments at an early stage. These thin, fragmented structures require high resolution (= a large number of finite points), which results in longer computation times compared to viscous flows where separation typically does not occur.
Additionally, the Langrangian solver was used for this simulation. At high flow speeds and resolutions, the time step size is small. While not demonstrated in this example, the NOGRID software also supports the inclusion of rigid bodies in th fluid domain (see FSI 3D Water Filter in a Pipe).
Capabilities of NOGRID points CFD software
NOGRID points is ideally suited for the design and problem solving of free surface flow applications. It enables accurate prediction of flow patterns, flow fronts, and flow velocities. NOGRID points provides valuable insights into flow behavior through the visualization of mass, momentum, and - if applicable - heat transfer in both single-phase and multi-phase systems. The software also delivers integral quantities that can be used to evaluate the efficiency and performance of the process.
NOGRID combines capabilities to handle free surface flow and moving parts in the domain and allows the simulation of any conceivable geometry and operating modes such as
- fully 3D computation solving the complete Navier-Stokes equations
- easy and intuitive setup also for FSI (Fluid-Structure-Interaction) cases
- freely definable material properties by equations or curves
- evaluation of chemical reactions and corresponding heat source terms
- open or closed domains including inflow and outflow areas (non-batch mode)
- moving of parts and flexible thermal contact behaviour
Why choose Nogrid?
NOGRID provides professional CFD software for the simulation of fluid flow, heat and mass transfer, and chemical reactions. Its efficient modelling workflow helps engineers analyse flow behaviour, evaluate designs and make informed decisions without creating a conventional volume mesh.
Faster model preparation
With NOGRID, only the geometry boundary needs to be meshed. The finite points inside the fluid domain are generated automatically according to user-defined settings, both at the start of the simulation and during the calculation.
This approach reduces preprocessing effort and makes it easier to prepare complex geometries and cavities for simulation.
Efficient CFD workflow
The modelling process follows four straightforward steps:
Build the geometry. Mesh the boundary. Define the simulation. Start the calculation.
NOGRID is designed to provide short computation times, including for applications involving complex cavities. Engineers can use the resulting data to examine flow distribution and other relevant flow characteristics.
Better insight into fluid-flow processes
CFD solves the fundamental equations governing fluid flow. NOGRID software enables engineers to predict and analyse the behaviour of fluids and related physical processes before or alongside physical testing.
The simulation results can support:
- evaluation and comparison of design alternatives
- optimisation of construction and operating parameters
- improved planning reliability
- reduction of development time and testing effort
- faster progression from design to market or operation
Steps from geometry generation to simulation results
TRAINING
Our two-day training courses teach participants how to set up, run and evaluate simulations efficiently with NOGRID CFD software. The courses include practical guidance for handling different types of simulation cases.
For more details please refer to Training Courses →
Technical Support
Professional support is available from the beginning of your work with NOGRID. Our technical team assists users by telephone and email with software operation, case setup and simulation-related questions.
For more details please refer to Software Support →
Simulation Service
When internal time, expertise or resources are limited, NOGRID can support your project with individual numerical simulation services. Our engineers develop and evaluate CFD models based on the specific requirements of your application.
For more details please refer to Software Support →