In free convection, the flow is initiated and driven by local differences in density. This effect plays an important role, for example, in the heating of rooms.
Our customer – as usual the illustration shows a highly simplified representation for reasons of confidentiality – regularly needs to fill pressure vessels. Due to the work performed on the gas, the temperature increases during the filling procedure. Temperature stratification results in the container, which gradually balances out.
For our customer, it was important to understand the cooling process in detail. They wanted to use this to draw conclusions about potential for optimization. So as starting values we implemented not just the geometry of the container, but the temperature stratification as well. Thanks to the intelligent choice of cell sizes and time increments, we were able to provide the customer with a very efficient and fast tool, which they can use to calculate and optimize.