The Unsteady Discrete Adjoint Method for Turbomachinery Applications
| Main Authors: | Ntanakas, G.,, Meyer, M., |
|---|---|
| Format: | Proceeding Journal |
| Terbitan: |
, 2017
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| Subjects: | |
| Online Access: |
https://zenodo.org/record/823136 |
Daftar Isi:
- The unsteady discrete adjoint method for the calculation of objective function gradients for transient turbomachinery compressible viscous flows is presented. The URANS state equations are used along with the one-equation Spalart-Allmaras model. The implementation relies on an existing unsteady three-dimensional unstructured grid solver and discrete adjoint capabilities previously developed for steady flows. The formulation of the adjoint equations is introduced within a generic time-dependent CFD optimal design problem. An adjoint sliding plane functionality is also presented in order to enable multi-row time-dependent adjoint calculations, exploiting the rotor-stator interface. Algorithmic Differentiation (AD) is used to compute differential terms. Two testcases, a turbine vane and a turbine stage, are selected to demonstrate the feasibility of the method.