Flat glass sheets are often produced by pouring the glass between two rollers, which are responsible to give the sheet the final thickness. Due to the cold rollers the glass viscosity is decreasing and the glass behind the rollers is almost inherently stable. The movie in figure 1 shows a rolling process (the geometry was published by G. Nölle: Technik der Glasherstellung, 1997). The color represents the temperature. The inlet temperature is increasing with the time, thus it appears that the glass sheet becomes more instable after a while.
Figure 1: Temperature distribution in a rolling process (geometry source: G. Nölle: Technik der Glasherstellung, 1997),
computation with CFD software NOGRID points
NOGRID points computes the real glass flow and temperature distribution in the complete forming area. It is also possible to perform the rolling process completely in 3D. 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 to incorporate the simulation into the design process to find an optimal design, thus saving time and effort in the design phase and increasing product quality.