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Pre-processing refers to all the steps, after mesh generation, required to prepare a CFD simulation: selection of mesh or meshes, definition of fluid properties and flow physics, specification of boundary conditions, etc.
In addition to the general mode of the CFD pre-processor, CFX-Pre, ANSYS provides a tailored turbomachinery mode. Using this Turbo-preprocessor mode, set-up of single or multiple component machines is intuitive and quick. Steps can be recorded easily for direct re-use on new machines or meshes, allowing complete automation of all pre-processing steps.
ANSYS CFX Preprocessing
Set-up options cover the entire range of turbomachinery-specific needs, allowing straight-forward pre-processing of all types of rotating machinery. Boundary conditions include periodic connections (with one-to-one matching and non-matching meshes), imported profiles, counter-rotating walls, absolute and relative frame total conditions and directions, etc.
Fluid properties may be simple (like those of air or water) or more complex, to include not just ideal but also real properties, as is required, for example, when simulating refrigerant and steam flows. In addition to incompressible flow, the ANSYS CFX solver covers the range of high speed gas flows from subsonic to transonic and supersonic speeds, with or without choked conditions, as might be expected in a high speed radial or axial compressor.
High fidelity effects such as change of state can also be incorporated in the analysis, for example wet steam conditions with condensation from the gas phase (e.g. in low-pressure steam turbine), or cavitating flow (e.g. in pumps). Applications extend to situations with two different fluids, such as an air-oil mixture in a partially filled torque converter, a partially submerged ship propeller, or sand erosion in a water turbine.
All of these physical flow situations can be defined for analysis with ANSYS CFX.
