Heat exchanger Average heat transfers 1 Bundle structures 1 CCGT 1 Comutatinal fluid dynamics 1 Conjugate heat transfer 1 Drag coefficient 1 Enhanced heat transfer 1 Genetic Algorithm 1 HRSG 1 Heat exchangers 1 Heat transfer 1 Heat transfer performance 1 Improved elastic tube bundle 1 Inlet flow 1 Inlet velocity 1 Installation 1 Low pitch materials 1 Modelling 1 Multi-objective optimization 1 Numerical research 1 Numerical results 1 OpenFOAM 1 Out-of-plane vibrations 1 SchwartzD 1 Triply Periodic Minimal Surface 1 Vibration 1 k-omega SST 1 simulation 1