Example on how to import a mesh from gmsh for StabFem

The present directory contains two examples : - square.msh2 for a very simple square domain - bluntbody.msh2 for a blunt body in a pipe

Note that after generation with gmsh, your mesh must be exported under format "version 2 ASCII" with extension ".msh2".

translation of the mesh is done in program "Mesh_GMSH.edp" (located in the folder SOURCES_FREEFEM/ of the project). See more explanations in this program and in the geometry definition files square.geo and bluntbody.geo used by gmsh.

NOTICE  - Initialization already done
WARNING - Detected verbosity = 4 in Publish mode ; not recommended ! switching to 2 instead

A first very simple example : square

ffmesh = SF_Mesh('GMSH_Mesh.edp','Options',{'file','square.msh2'});
figure; SF_Plot(ffmesh);

A second example : blunt body in pipe

ffmesh = SF_Mesh('GMSH_Mesh.edp','Options',{'file','bluntbody.msh2'});
figure; SF_Plot(ffmesh,'boundary','on','bdlabels',1);

generating a base flow

bf = SF_BaseFlow(ffmesh,'solver','Newton_2D.edp','Re',1);
bf = SF_BaseFlow(bf,'Re',10);
bf = SF_BaseFlow(bf,'Re',50);
bf = SF_Adapt(bf); % always better !
bf = SF_BaseFlow(bf,'Re',50);
figure; SF_Plot(bf,'ux');
WARNING -  Folder ./WORK/MESHBF not found : creating it !

stability analysis

[ev,em]= SF_Stability(bf,'solver','Stab_2D.edp','nev',10,'shift',1i+.2,'plotspectrum',true);
figure; SF_Plot(em(1),'ux');


Here boundary conditions are slip conditions on upper/lower walls because label attributed to these boundaeries is 4. Use 2 for no-slip.