# Computational Fluid Dynamics Software - CFD SOFTWARE

Computational fluid dynamics (CFD)
is a branch of fluid mechanics that uses numerical analysis to solve problems that involve fluid flows. Computers are used to perform the calculations required to simulate the interaction of liquids and gases with surfaces defined by initial and boundary conditions.

The fundamental basis of almost all CFD problems are the Navier–Stokes equations. The Navier–Stokes equations are a statement of the balance of momentum, but sometimes the equations for conservation of mass and the balance of energy are added.

In order to solve the Navier–Stokes equations the fluid domain must be discretized, that means the volume occupied by the fluid is divided into discrete cells (the mesh). The Finite Volume Method (FVM) is a common approach used in CFD codes, as it has an advantage in memory usage and solution speed, especially for large problems, high Reynolds number turbulent flows and source term dominated flows (like combustion). The Finite Element Method (FEM) is used in structural analysis of solids, but is also applicable to fluids. The Finite Difference Method (FDM) has historical importance and is easy to implement. It is currently only used in few specialized codes, which handle complex geometry with high accuracy and efficiency.

NOGRID points software, based on the meshless Finite Pointset Method (FPM), is a Computational Fluid Dynamics (CFD) software package for simulation tasks in the wide area of flow and continuum mechanical problems. The software doesn't solve only fluid flows, but also problems with elastic or plastic deformations. More generally spoken, NOGRID points software considers all the viscous as well as elastic/plastic stress tensors and any mixture of it.

NOGRID points software does not require a grid or mesh, in contrast to classical numerical methods, such as Finite Elements or Finite Volumes, where the generation of meshes takes a long time. NOGRID points can excellently be applied in case of all problems, where grid-based methods reach their limits due to the necessary remeshing. The software is based on one of the latest technologies in the area of numerical flow simulation.