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Fluid Dynamics Demo 2:
A 2-D incompressible CFD problem using triangles and a projection time integration method

  

The main program

We present an program that solves the 2-D time-dependent incompressible Navier-Stokes equations. For this demo, we solve these equations by a time integration projection method. Space discretisation is handled by a triangular finite element method.

  

An example

Let us run this program with the data presented in the following project file:

<?xml version="1.0" encoding="ISO-8859-1" ?>
<OFELI_File>
<info>
   <title></title>
   <date></date>
   <author></author>
</info>
<Project name="cavity">
   <time_step value="0.01"/>
   <max_time value="0.5"/>
   <verbose value="1"/>
   <plot value="10"/>
   <mesh_file value="cavity-30.m"/>
   <parameter label="Reynolds" value="1"/>
   <parameter label="v_file" value="cavity.v"/>
   <parameter label="p_file" value="cavity.p"/>
</Project>
<Prescription>
   <BoundaryCondition code="2" dof="1">1</BoundaryCondition>
</Prescription>
</OFELI_File>

Note that we have also a section describing prescription data where a boundary condition is given: We impose the value 1.0 to the horizontal velocity dof="1" for nodes with a code equal to 2. All other data that are not given are by default set to 0.

 
Copyright © 1998-2013 Rachid Touzani