TY - JOUR
TI - Assessment results of fluid-structure interaction numerical simulation using fuzzy logic
AU - Marković Zoran J
AU - Stupar Slobodan N
AU - Dinulović Mirko R.
AU - Peković Ognjen
AU - Stefanović Predrag Lj
AU - Cvetinović Dejan B
JN - Thermal Science
PY - 2016
VL - 20
IS - 11
SP - 235
EP - 250
PT - Article
AB - A fuzzy approximation concept is applied in order to predict results of  coupled computational structure mechanics and computational fluid dynamics  while solving a problem of steady incompressible gas flow through thermally  loaded rectangular thin-walled channel. Channel wall deforms into wave - type  shapes depending on thermal load and fluid inlet velocity inducing the  changes of fluid flow accordingly. A set of fluid - structure interaction  (FSI) numerical tests have been defined by varying the values of fluid inlet  velocity, temperature of inner and outer surface of the channel wall and  numerical grid density. The unsteady Navier-Stokes equations are numerically  solved using an element-based finite volume method and second order backward  Euler discretization scheme. The structural model is solved by finite element  method including geometric and material nonlinearities. The implicit two-way  iterative code coupling, partitioned solution approach, were used while  solving these numerical tests. Results of numerical analysis indicate that  gravity and pressure distribution inside the channel contributes to  triggering the shape of deformation. In the inverse problem, the results of  FSI numerical simulations formed a database of input variables for  development fuzzy logic based models considering downstream pressure drop and  maximum stresses as the objective functions. Developed fuzzy models predicted  targeting results within a reasonable accuracy limit at lower computation  cost compared to series of FSI numerical calculations. Smaller relative  difference were obtained when calculating the values of pressure drop then  maximal stresses indicating that transfer function influence on output values  have to be additionally investigated. [Projekat Ministarstva nauke Republike  Srbije, br. III42010, br.TR33050 i br. TR35035]