Reduced order modeling of fluid flow and heat transfer in tube-fin heat exchanger

The reduced order model (ROM) of a tube-fin heat exchanger was developed based on the proper orthogonal decomposition (POD) technique. The flow and temperature fields of a tube-fin heat exchanger were obtained from numerical simulation at different Reynolds number, which is 100-2 000.The best orthogonal decomposition method was used to the system sample to get POD basis functions and spectral coefficient. The POD basis function has the best characteristics of energy. In the reconstruction formula, a smaller cut freedom may be the solution of the original physical problem accurately. The spectral coefficient in non-design parameters was obtained by linear interpolation at the reconstruction formula. The results show that the reduced order model can predict the temperature and velocity field of the tube-fin heat exchanger quickly and accurately and the calculation time is 1 200 times faster than that of SIMPLE algorithm.