Abstract -In this thesis a design of a Coriolis mass flow-meter is chosen by considering all advantages and disadvantages and the project requirements. The chosen geometry is imported into COMSOL, because modelling is implemented by FEM and two different physics should be coupled. To consider both applications of the device include measuring density and flow rate, modeling is divided into two parts: Coriolis density meter and Coriolis mass flow-meter. Both applications are based on Fluid Structure Interaction. The results are compared to existing setup’s experimental data. Keywords: Coriolis mass flowmeter, Fluid Structure Interaction, Modal order, FEM, Acoustic Shell Interaction, Phase-shift, Disposable and Polymer.