Simulation Flushing Toilet

CAD model toilet groups created in NOGRID's COMPASS

Figure 1: CAD created in NOGRID's COMPASS

Flushing toilet GUI setup in NOGRID points CFD software

Figure 2: Setup flushing case in the GUI

Simulation results flushing toilet within NOGRID points CFD software GUI

Figure 3: Result view of the flushing case in NOGRID points' GUI

Animation flushing toilet in NOGRID points CFD software

Figure 4: Temperature plot over time for the flushing case

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

computation is in full 3D solving complete Navier-Stokes-Equations
easy and intuitive setup also for FSI (Fluid-Structure-Interaction) cases
free 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

Whitepaper Nogrid points Technology

Nogrid's strengths

Particular strengths of NOGRID's fluid flow CFD software are the rapid preprocessing (no fluid grid needs to be generated, only the boundary mesh, inner finite points are generated automatically depending on User setting initially and during computation), and the outstandingly short computation time even for complicated cavities.

As you can see in the image below, the boundary of the geometry still requires a mesh to allow the interior finite points to detect the boundary. The boundary must therefore be meshed and the finite points inside are automatically generated during the simulation controlled by User specifications.

Easy and fast modelling: Build geometry, mesh boundary, setup the case and start computation

What is CFD from NOGRID?

CFD solves the fundamental equations that define the fluid flow process. With CFD software from NOGRID every engineer makes better decisions by predicting, analyzing and controlling fluid flow, heat and mass transfer or chemical reaction. By using NOGRID software for flow modeling you receive information on essential flow characteristics as for example flow distribution. Using it additional to testing and experimentation NOGRID software helps to improve the evaluation of your design – resulting in better construction and operation parameters, increasing planning security and money savings due to faster time to the marketplace for your product or process.

Choose NOGRID

With NOGRID, you choose professional CFD software and services – our aim is helping you to be successful. When you decide to work with NOGRID you choose close cooperation with a dynamic, flat hierarchies-organization. Short information channels result in quick and accurate professional support and service. Our team consists of highly qualified employees, who are experts in fields such as numerical simulation or computational fluid dynamics. Based on our know-how, we are pleased to offer the following services, responding to your individual requirements:

TRAINING

In our two-days training courses you will learn, how to use NOGRID CFD software efficiently. Our technical support team will teach you how to handle and solve different cases.

For more details please refer to Training Courses →

Technical Support

We offer full professional support from the minute you start using our software, by telephone or by email. Contact us, when ever needed.

For more details please refer to Software Support →

Service

Lack of time or resources and other constraints often make outsourcing an attractive solution. We help you with your flow modeling needs. Based on our engineering expertise in this field we offer individual numerical simulation services matching the unique needs of your organization.

For more details please refer to Simulation Services →