Mesh Glueing in Thermo-Mechanical Solutions We presented in previous ADINA News, mesh glueing applications for mechanical problems without thermal effects (see News of Nov. 30, 2007, Nov. 15, 2007, Apr. 30, 2007, and Jan 15, 2007).
In many practical applications it is desirable to use the same finite element
model for mechanical and thermal or thermo-mechanical-coupled solutions. The model
might have in different regions fine meshes and coarse meshes of totally different
element types connected to each other, e.g., - linear and nonlinear static and implicit dynamic analyses
- linear and nonlinear, steady state and transient heat flow solutions
- one-way and fully coupled thermo-mechanical problems (with or without contact conditions)
To illustrate how glueing for thermo-mechanical problems works, we consider a simple
2-D patch test, with different meshes of 9-node 2-D plane stress elements,
confined on three sides and with prescribed convection at the top and prescribed zero
temperature at the bottom:
In the plots below, we see a linear temperature distribution and a constant heat
flux with no jumps (the exact analytical solution) across the glueing line. Note
that the values plotted below have not been smoothed. The effective stress is
also continuous across the glueing line:
Below, we show a turbine blade
subjected to heat flux, temperature and centrifugal loading. Mesh glueing is
used to connect the different meshes used for the root and blade. As shown
in the figures below, the temperature distribution across the glued surfaces
is very smooth.
Clearly, with thermal effects now also included, the ADINA glueing capability will prove even more useful in many applications. |