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Researchers : Yeojeong Kim
Motivation & Objectives
- Suboptimal feedback control (SFC) theory (Choi et al. 1994 JFM) is a feedback control theory based on the optimal control theory used widely for design optimization for flow problems.
- The previous SFC theory have several issues.
: it has an arbitrary constant C because it is based on the gradient algorithm.
it is based on adjoint system, thus, the computational cost is expensive.
- In order to develop a computationally inexpensive approach for SFC theory (revised suboptimal feedback control (RSFC) theory), SFC theory reformulated as a tabulated approach and using the modified Green's function method.
Flow fields
1. Control of the Taylor vortex problem
- Computational domain for non-periodic Taylor vortex flow
< with the same region for the actuator and sensor >
< with a wider sensor than the actuator >
- Control of Taylor vortex flow using the RSFC method
< No control >
< RSFC control with original sensor >
< RSFC control with wide sensor >
2. Control of the turbulent channel flow at Re_tau = 180
- Computational domain
< No control >
< RSFC control >
- Vortex reduction after the flow control using the RSFC method (left: no control, right: control using the RSFC method)
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