[Getdp] Magnetodynamics with cohomology conditions

Maximilian Szczesliwski maximulianszczesliwski at gmail.com
Tue Aug 13 16:01:28 CEST 2013


After serveral days of trying to build a similar model like
"Magnetodynamics with cohomology conditions", I would like to ask you
kindly for help. Is it possible to calculate only a slice of such a problem
using cohomology conditions? The goal is to reduce the number of elements
in piecewise symmetric problems like in an induction heating process with
several shunts around the inductor.

Please find below my .geo-file.

I would be greatefull for any help.

Maximilian

/*+++++++++++++++++++++++++++++++++++++++++++++
++++++++++++  .GEO   +++++++++++
+++++++++++++++++++++++++++++++++++++++++++++*/




Mesh.Algorithm3D = 4;
// General.RotationCenterX=270;
// General.RotationCenterY=0;
// General.RotationCenterX=360;
freq=50; // frequenz
curr=4242*Sqrt(2); // Stromstärke
eps=1.e-6;

xs1=0.25; // Radius Schmelze unter der Schräge
xs2=0.325; // großer Radius Schmelze
y_nenn=1; // Nennhöhe
ys1=0.180; // höhe der Schräge

wz=1; // windungszahl
wd=0.004; // windungsabstand
xw1=0.425; // innenradius ind
xw11=xw1+0.00825; // außenradius eckiger teil
hw=0.0195; // höhe ind
rw1=0.0065; // innenradius runder teil
rw2=rw1+0.00325; // außenradius runder teil
h1=0; // untere Z- Position der ersten Windung
h2=hw; // obere Z- Position der ersten Windung
phi=Pi/100; // Rotationswinkel


rair=3*y_nenn; // Radius Airbox
rinf=4*y_nenn; // Radius Infinity

Point(1)={0,0 ,0, 0.01};
Point(2)={xs2,0 ,0, 0.01};
Point(3)={0,0 ,y_nenn, 0.01};
Point(4)={xs2,0 ,y_nenn, 0.01};



// Einsatz
einsatz_in[]={};
einsatz_out[]={};
vol_Einsatz[] = {};

Line(1) = {1,2};
Line(2) = {2,4};
Line(3) = {3,4};
Line(4) = {1,3};

Line Loop(5) = {1,2,-3,-4} ;
Plane Surface(1) = {5} ;
tmp[] = {1};
einsatz_in[]=tmp[0];

tmp[] = Extrude { {0,0,y_nenn}, {0,0,0} ,  phi}{ Surface {tmp[0]}; Layers
{0.02}; };
vol_Einsatz[] = tmp[1];
einsatz_out[]=tmp[0];

// Induktor
wz=20; // windungszahl
wd=0.004; // windungsabstand
xw1=0.425; // innenradius ind
xw11=xw1+0.00825; // außenradius eckiger teil
hw=0.0195; // höhe ind
rw1=0.0065; // innenradius runder teil
rw2=rw1+0.00325; // außenradius runder teil
wg=0;

// coil winding
in[]={};
out[]={};
vol_Induktor[] = {};
loop[]={};
For t In {1:wz}

p=newp;
Point(p+1)={xw1,0 ,wg, 0.005};
Point(p+2)={xw11,0 ,wg, 0.005};
Point(p+3)={xw1,0 ,hw+wg, 0.005};
Point(p+4)={xw11,0 ,hw+wg, 0.005};

l=newl;
Line(l+1) = {p+1,p+2};
Line(l+2) = {p+3,p+4};
Line(l+3) = {p+1,p+3};
Line(l+4) = {p+2,p+4};

ll=newll;
Line Loop(ll)={l+1, l+4, -(l+2), -(l+3)};


s=news;

Plane Surface(s) = {ll};
tmp[] = {s};
in[]+=tmp[0];


tmp[] = Extrude { {0,0,y_nenn}, {0,0,0} ,  phi}{ Surface {tmp[0]}; Layers
{0.02}; };
vol_Induktor[] += tmp[1];
out[]+=tmp[0];

wg = t*(hw+wd);
loop[]+={ll};
EndFor


// Air
air_in[] = {};
air_out[] = {};
vol_air[] = {};

p=newp;

Point(p+1)={0,0 ,-3*y_nenn, 0.5};
Point(p+2)={4*y_nenn,0 ,-3*y_nenn, 0.5};
Point(p+3)={0,0 ,4*y_nenn, 0.5};
Point(p+4)={4*y_nenn,0 ,4*y_nenn, 0.5};

l=newl;
Line(l+1) = {p+1,p+2};
Line(l+2) = {p+3,p+4};
Line(l+3) = {p+1,1};
Line(l+4) = {3,p+3};
Line(l+5) = {p+2,p+4};

ll=newll;
Line Loop(ll)={l+3, 1, 2, -3, l+4, l+2, -(l+5), -(l+1)};

Line Loop(ll+2)={l+3, 4, l+4, l+2, -(l+5), -(l+1)};
s=news;
loop[]+=ll;
Plane Surface(s) = loop[];

tmp[] = {s};
air_in[]+=tmp[0];

tmp[] = Extrude { {0,0,y_nenn}, {0,0,0} ,  phi}{ Surface {tmp[0]}; Layers
{0.02}; };
vol_air[] += tmp[1];
air_out[]+=tmp[0];

Einsatz = 10000;
Induktor = 20000;
Air = 30000;

SKIN_Einsatz = 11000;
Einsatz_OUT = 12000;
Einsatz_IN = 13000;
SKIN_Induktor = 22000;
OUT = 220000;
IN = 200002;
Inf_Air = 33000;
Air_IN=34000;
Air_OUT=35000;

Physical Volume(Induktor) = {vol_Induktor[]};
Physical Volume(Einsatz) = {vol_Einsatz[]};
Physical Volume(Air) = {vol_air};

Physical Surface(IN)= in[];
Physical Surface(OUT)= out[];
skin_induktor[]={};
skin_induktor[]=CombinedBoundary{ Volume{vol_Induktor[]}; };
skin_induktor[] -= {in[], out[]};
Physical Surface(SKIN_Induktor) = skin_induktor[];
skin_einsatz[] = {};
skin_einsatz[] = Boundary { Volume{vol_Einsatz[]}; };
skin_einsatz[] -= {einsatz_in[], einsatz_out[]};
Physical Surface(Einsatz_IN)= einsatz_in[];
Physical Surface(Einsatz_OUT)= einsatz_out[];
Physical Surface(SKIN_Einsatz) = skin_einsatz[];

Physical Line(999999) = {84,4, 85};
// axis[]={56, 4, 55};
Physical Surface(Inf_Air) = {90, 97, 93}; // , 61, 113};




Physical Surface(Air_IN)= air_in[];
Physical Surface(Air_OUT)= air_out[];

// Cohomology computation for the A-V method
Cohomology(1) {{Induktor},{IN,OUT}};
Cohomology(1) {{Einsatz,},{Einsatz_IN,Einsatz_OUT}};
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