Real Boundary conditions for Navier-Stokes are extremely complex. It is possible to find solutions for Navier-Stokes equations introducing periodic boundary conditions. Flows simulated appear in a computational domain which is moving at a constant velocity.
Periodic boundary conditions for Navier-Stokes are applied using the same value of the rate of physical properties of the flow in the first and the last node of the computational domain. Some high-order schemes  uses more nodes, and it is necessary apply the same procedure, for example the second node has the same value of the penultimate node, and so on. Periodic boundary conditions have the advantage of short time of computation.
We have simulated a compressible jet which has periodic boundary conditions in II-UNAM.
- Fluid: Air
- Periodic Boundary Conditions
- Free code
- By Abraham Aguilar II_UNAM