Lesimx-incomp solves for incompressible fluid flow and heat transfer. It assumes that fluid is incompressible and Newtonian. For heat transfer problems, adiabatic, given temperature or heat flux on a solid-fluid interface can be handled. Conjugate heat transfer can also be simulated. Solid bodies inside the fluid domain can be regular solid bodies or shells with arbitrary shape and zero thickness. Both solid bodies are represented by level sets. It also has two-phase capability with the interface captured using a coupled level set and VOF scheme.

Figure 1 shows air flow in an office building. The separation walls between each cube are represented by solid bodies without thickness, a unique feature in Lesimx-incomp.  Figure 2 shows a simulation of fluid flow and heat transfer in an enclosed space. Different thermal boundary conditions between solid-fluid interface and conjugate heat transfer can be handled. Figure 3 shows a simulation of a channel flow with solid bodies placed inside it. These solid bodies have negligible thickness.