Abstract
The Air Force Research Laboratory has an ongoing effort to develop an accurate and efe cient computational tool to support the development of advanced chemical oxygen/iodine laser (COIL)devices. In this study, a series of computational simulations have been performed to provide a better understanding of e uid dynamic phenomena withingeometriesassociatedwithCOILe owe elds.Theparallel,implicitunstructuredNavier ‐StokescodeCobalt 60 was used to compute laminar, turbulent, and unsteady e ows of helium within the research assessment and device improvement chemicallaser (RADICL)nozzle. Computational results showing details of thejetmixing interaction and topological structure are presented. The laminar and turbulent results obtained with Cobalt 60 are in excellent agreementwithmeasuredmasse owratesandsurfacepressuredataobtainedfromrecentcold-e owtestsperformed with the RADICL device. Insufe cient experimental measurement prevents the determination of whether or not transition occurs within the injector region. The laminar time-accurate results indicate small-scale unsteadiness in the frequency range of 200 kHz downstream of the nozzle throat.
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