RT Filtertechnik stands for innovative and customer-oriented solutions. In addition to comprehensive measuring and test programs in the field and on special test benches, we also carry out various flow simulations. The flow simulation in the hydraulic tank is particularly practical, as tanks are frequently not adapted sufficiently to the system for historical reasons. For example, in the past, simulations revealed that in some tanks there are dead areas in which the oil does not flow at all or that tanks could be built up to 30% smaller with optimised tank filter systems. We are glad to support our customers during the project engineering and modification phase of tank systems to achieve maximum efficiency.

We can carry out the following simulations:

Simulation types:

  • Basic CFD (computational fluid dynamics) calculation (e.g. flow profile in the tank)
  • Multi-phase simulations (e.g. for oil movements in the tank during operating cycles)
  • Bubble simulation (e.g. air bubbles in the oil)
  • Heat transfer (e.g. for temperature emission of the tank)
  • Analysis of the results and any improvement suggests for re-design



Basic CFD calculations:

The illustration of the flow profile shows clearly that with the original filter/tank combination (left), oil only flows through half the tank, whereas the optimised design (right) makes full use of the tank. In this case, our customer was able to save 10% of the oil at the same performance.

Multi-phase simulations:

The multi-phase simulation shows how the oil circulates in the tank. It thus shows how much the oil causes the surface to ripple when it flows back into the tank. The more the oil bubbles up, the higher the internal ingress of air in the oil is.

One can also see whether during the braking operation of a mobile machine, oil can be discharged via the breather filter and which countermeasures need to be taken (e.g. by the application of a baffle).

Bubble simulation:

The bubble simulation visualises the movement of individual air bubbles in the oil. The figure shows clearly that the simulation corresponds very well to actual measurements.

Heat transfer:

The heat transfer simulation can be used e.g. to compare the thermal radiation of a metal tank with that of a plastic tank.