Computational Fluid Dynamics

Both in air-conditioning and process air-related questions, a CFD simulation (CFD = computational fluid dynamics) can help to save costs and prevent unnecessary failed tests or complex test positions.

In the field of industrial production and processing, the design work for a flow optimisation in a machine often gives rise to questions about its effects on the process air. This is why experiments are frequently conducted where parameters such as local speeds, temperatures or turbulences are recorded in order to check in advance the effect of the planned measure. In many applications, this is however not possible at all during planning, and after implementation only with major effort, for example with rotating vanes, non-stationary processes with insufficient measurement ranges or in extremely hot applications. The solution: a CFD simulation that already computes and visualises the air flows and thermodynamic effects during the design phase. For a reliable and predictable result.

In many air-conditioning applications, a CFD simulation provides valid statements, for example on pressure distribution inside a ventilation system, on air flow or on flow optimisation for components. To do so, computation models such as Navier-Stokes equations, Euler or potential equations are used for computing air flows. An example from actual practice:

 

Validation of a heating/cooling concept in an aircraft building

Air-conditioning with displacement-air outlets in the “terminals” distributed in the area and also additional heating units were planned. The criteria to be checked were the temperature distribution and the flow field inside the area. To further minimise the computational effort and hence the costs, the model did not simulate the entire terminal, but only two representative sections of it. Symmetry constraints were imposed on the interfaces; the computations were done in 3D and stationary. The computation results showed, for both the cooling and heating cases, a balanced temperature distribution where the temperature gradient could be classified as per DIN EN ISO 7730 – the concept was therefore corroborated.

Are you too dealing with flow technology questions? Would you like to check a planned air-conditioning concept or a new production process in advance, or to check an existing installation? The LTG engineers will be glad to help – just contact us!

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CFD Simulation