A hybrid Trefftz finite element (HT FE) model fl~r postbuckling analysis of thin plates is presented, based on a modified variational principle. With the aid of incremental form of equilibrium equations, all non-linear terms may be viewed as pseudo-loads, and then the in-plane and out-of-plane equations can be unoccupied. As a consequence, the solution procedure for the postbuekling plate becom...

H1-conforming Galerkin methods on polygonal meshes such as VEM, BEM-FEM and Trefftz-FEM employ local finite element functions that are implicitly defined solutions of Poisson problems having polynomial source boundary data. Recently, have been extended to allow for mesh cells curvilinear polygons. Such extensions present new challenges determining suitable quadratures. We describe an approach i...

This paper discusses a mathematical model for airflow through cross-flow plate heat exchanger. The exhaust air is used to the supply air. Three kinds of plates are considered: made aluminium, copper, and steel. purpose this research was verify which material build exchangers uses more efficiently. method Trefftz function determine approximate solutions analysed problem. results obtained 1.2 mm-...