NOGRID points computes the real glass flow and temperature distribution during the complete forming step and is also able to predict the appearance of chill ripples. Comparisons with various experimental data have shown the high precision of the simulation of this intricate flow process. The short computation time allows our customers incorporating the simulation into the design process to find an optimal design, thus saving time and effort in the design phase and increasing product quality.
Simulation Software for Fluids and SolidsSimulation of chill ripples formation
during glass pressing
The simulation of chill ripples formation during a glass pressing process can perfectly be performed with our CFD software NOGRID points. This software enables engineers to model the chill ripple formation with high accuracy.
Understanding Chill Ripples in Glass Pressing
If hot glass comes into contact with cold forming tools, three different kinds of typical hot forming defects usually limit the process window in glass forming processes. The first defect is sticking of the glass at the forming tools (chemical reactions between glass and forming material occurs), if the temperature is above a certain value. The second type of defects are hot forming cracks in the glass and the third forming defect is the appearance of chill ripples, which occur if the temperature of the forming tool is too low. Chill ripples are also known as press ripples or flow ripples. Sometimes these ripples can be observed on hollow ware products, such as pressed wine glasses, in the form of concentric waves on the surface of the foot.
How NOGRID points simulates chill ripples formation
In the 2D example shown here, both the metal forms (mold and plunger) and the glass are computed as solids. Since the two metallic solids and the liquid glass are computed together in one model, this is also referred to as a so-called multi-phase flow. If the hot glass comes into contact with the cold tools, a contact temperature and a flow of heat are set up immediately. The cold metal molds heat up and the hot glass cools down.
NOGRID points unites the capabilities to handle free surface flow and moving parts in the domain and allows the simulation of any conceivable geometry and operating mode, such as
- fully 3D computation solving the complete Navier-Stokes-Equations
- easy and intuitive setup
- freely definable material properties by equations or curves also for non-Newtonian fluids
- evaluation of chemical reactions and corresponding heat source terms
- open or closed domains including inflow and outflow areas (non-batch mode)
- moving of parts
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.
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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 →