-- Decrease the element number. In fracture mechanics, a fine mesh is necessary radially to the crack front and more rarely along the front axis. Yet hexahedrons and prisms elements can have geometrical aspect ratios up to 20 without major matrix conditioning problems. On the contrary, tetrahedrons of free meshes are generally limited to aspect ratios around 3. The use of very elongated elements is then no longer a limitation and number of elements can be significantly decreased.\r
+- Decrease in the number of elements. In fracture mechanics, a fine mesh is required radially at the fissure front and more rarely in the axis of the front. Hexhedral and prismatic elements can have geometric aspect ratios of up to 20 without major matrix conditioning problems. On the other hand, the tetrahedrons of free meshes are generally limited to aspect ratios of about 3. The use of very elongated elements is then no longer a limitation and the number of elements can be considerably reduced.\r