# Frequent question: What solver does ANSYS use?

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## What is direct solver in ANSYS?

As you note, the direct solver, also called the SPARSE SOLVER, uses LU decomposition to solve the stiffness matrix equation. The PCG solver uses an iterative algorithm to solve the stiffness matrix equation. In a linear analysis, that is done once.

## What equations does ANSYS use?

1.2 Continuity and Momentum Equations

For all flows, ANSYS FLUENT solves conservation equations for mass and momentum. For flows involving heat transfer or compressibility, an additional equation for energy conservation is solved.

## What is solver FEA?

How the matrix of equations is solved in FEA is the task of the solver. As computer hardware and computational techniques evolve, new solvers are added to the software. Each analysis type has various solvers to choose from.

## What ANSYS product service will you use to perform FEA?

Ansys Mechanical is your solution for finite element analysis (FEA) software for structural engineering.

## What solver does SimScale use?

SimScale is based on cutting-edge open source solver technology, including OpenFOAM, which is currently used by leading companies in a large number of industries such as automotive (BMW, Ford, Volkswagen), aerospace, (Airbus), process technology (Siemens), and power generation (General Electric).

## What is iterative solver?

Iterative algorithms solve linear equations while only performing multiplictions by A, and perform- ing a few vector operations. Unlike the direct methods which are based on elimination, the iterative algorithms do not get exact solutions. Rather, they get closer and closer to the solution the longer they work.

## What is governing equation in CFD?

Navier-Stokes equations are the governing equations of Computational Fluid Dynamics. It is based on the conservation law of physical properties of fluid. The principle of conservational law is the change of properties, for example mass, energy, and momentum, in an object is decided by the input and output.

## Why We Use governing equations?

The governing equations of a mathematical model describe how the values of the unknown variables (i.e. the dependent variables) change when one or more of the known (i.e. independent) variables change.

## What is Navier-Stokes equation in fluid mechanics?

Navier-Stokes equation, in fluid mechanics, a partial differential equation that describes the flow of incompressible fluids. The equation is a generalization of the equation devised by Swiss mathematician Leonhard Euler in the 18th century to describe the flow of incompressible and frictionless fluids.

## What is direct solver?

Direct Solver:

In the case of direct solver, you find the inverse of matrix [K] and then multiply with {f}. As this method involves inverting the matrix, it is mostly preferred for computationally less expensive problems.

## What is direct sparse solver?

The direct solver, Direct Sparse, solves the set of equations directly without any approximations and hence there are no errors associated with the solution process. There will still be discretization errors which are present both in iterative or direct solvers.

## What is stiffness matrix in FEM?

In the finite element method for the numerical solution of elliptic partial differential equations, the stiffness matrix represents the system of linear equations that must be solved in order to ascertain an approximate solution to the differential equation.

## What ANSYS product service will you use to perform CFD?

Ansys EnSight

General purpose post-processing software for a wide range of simulations including CFD, FEA, MBD, DEM and CAE.

## Is LS Dyna part of ANSYS?

In November 2019, Ansys acquired LSTC, the authors of the explicit finite element code LS-DYNA. Ansys LS-DYNA is the most used explicit simulation program, capable of simulating the response of materials to short periods of severe loading.

## Which is better ANSYS or SolidWorks?

For FEA analysis, Ansys is much better than SolidWorks. For modelling purpose SolidWorks is right. FE can be better done through ANSYS whereas Solid modeling can be dont better through SOLIDWORKS. Both have facility of solid modelling as well as FE but its better to go separately.