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A recent comparison between deep VLA HI observations and dynamical models ofthe Virgo cluster spiral galaxy NGC 4654 has shown that only a model involvinga combination of a tidal interaction and ram pressure can reproduce the data.Deep radio polarization studies, together with detailed MHD modeling, canindependently verify those conclusions, that are based on HI observations anddynamical models. We performed deep polarized radio-continuum observations ofthe Virgo cluster spiral galaxy NGC 4654 with the Effelsberg 100m telescope at8.35 GHz and the VLA at 4.85 GHz. Detailed 3D MHD simulations were made todetermine the large-scale magnetic field and the emission distribution of thepolarized radio continuum in the model, during the galaxy evolution within thecluster environment. This direct comparison between the observed and simulatedpolarized radio continuum emission corroborates the earlier results, that thegalaxy had a recent rapid close encounter with NGC 4639 and is undergoing weakram pressure by the intracluster medium. This combination of deep radiopolarization studies and detailed MHD modeling thus gives us unique insightinto the interactions of a galaxy with its cluster environment. It represents adiagnostic tool that is complementary to deep HI observations.Comment: Corrected galaxy name in captions of figures (1 & 2

NGC 4654: polarized radio continuum emission as a diagnostic tool for a galaxy-cluster interaction