Approximate solution method for unsteady calculations using nonlinear harmonic methods.
In the fluid analysis of turbo machinery, unsteady calculations that model the entire blade row incur significant computational costs. One solution to this problem is an approximate method for unsteady calculations using nonlinear harmonic methods. This approach involves decomposing the flow field into time-averaged and time-varying components, solving the transport equations for each, and reconstructing the unsteady flow field from these components. This method eliminates the need for unsteady calculations and allows for modeling only the flow path of one blade or a blade pattern, significantly reducing computation time and memory usage. Additionally, it is expected to achieve higher accuracy compared to steady calculations. This paper discusses the visualization of unsteady flow reproduction during the presentation.
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