March 6 - 8, 2017 | Berlin
LEADING ENGINEERING SIMULATION CONFERENCE
Endress+Hauser Flowtec offers different flow meters for the process industry which are based on different physics principle, such as Coriolis, Ultrasonic and magnetic-inductive. In order to build a model of the complete behavior of the flow meters, the flow field simulations are not sufficient. For instance, for modelling an Ultrasonic flow meter, one requires to couple flow fields with the acoustics field to account for coupled physical effects. The challenge in modeling an US flow meter is the presence of high frequency or small wavelength acoustic waves which makes the computations extremely memory demanding. Furthermore, convective effects from the flow have to be taken into account in the acoustic solver by accounting additional terms in the governing equation for the acoustics.
Using the acoustic perturbation equation in STAR-CCM+®, the influence of mean flow field is modeled for one of the ultrasonic flow meter of Endress+Hauser Flowtec AG. The time-of-flight (ToF) of the acoustic wave is obtained with the help of coupled transient simulations. The difference in ToF for two piezoelectric sensors is a measure of the flow speed in the meter which is compared with the pure CFD analysis and the experimental results for different Reynolds numbers. The problem resulted in several million of degrees of freedom (DoFs), up to 70 Million, for the acoustic domain. The number of DoFs depends on the resolution of the wave length, domain size and the excitation frequency of the