Hallo,
I still do not know how to do it. Maybe my question was badly formulated, so I
retry:
What I want is a mesh density around a an area that goes like this:
Mesh density
^
| ----------------
| \
| \
| \
| -----------
| \
| \
| \
| -------------
|
| ^ DistMin 1
| ^ DistMax 1
| ^ DistMin 2
| ^ DistMax 2
_________________________________________________> Distance from attractor
This is what I tried to get it:
Field[2] = Threshold;
Field[2].IField = 1;
Field[2].LcMin = 0.001;
Field[2].LcMax = 0.005;
Field[2].DistMin = 0.05;
Field[2].DistMax = 0.2;
Field[3] = Attractor;
Field[3].NodesList = {5};
Field[4] = Threshold;
Field[4].IField = 3;
Field[4].LcMin = 0.005;
Field[4].LcMax = 0.1;
Field[4].DistMin = 0.3;
Field[4].DistMax = 0.5;
Field[5] = Min;
Field[5].FieldsList = {2,4};
Background Field = 5;
But it does not work. It creates only ONE area with higher density around the
point 5.
What do have have to do to make it work?
thanks it advance and
kind regards
Moritz Nadler
Moritz Nadler wrote:
Hallo,
I want to have 2 threshold fields around one attractor so I get get
one area with very fine mesh directly around the attractor point
from the attractor point to the DistMin value of the inner threshold field.
Then a linear mesh density gradient from the DistMin to DistMax value of
the first threshold field where at DistMax the mesh density of the
second threshold field is reached and stays until the DistMin value of
the second threshold is reached
And then a linear density gradient from DistMin to DistMax of the second
threshold field.
What I thourght is the obvous way to do this did not work:
Field[1] = Attractor;
Field[1].NodesList = {5};
Field[2] = Threshold;
Field[2].IField = 1;
Field[2].LcMin = 0.001;
Field[2].LcMax = 0.005;
Field[2].DistMin = 0.05;
Field[2].DistMax = 0.2;
Field[3] = Attractor;
Field[3].NodesList = {5};
Field[4] = Threshold;
Field[4].IField = 3;
Field[4].LcMin = 0.005;
Field[4].LcMax = 0.1;
Field[4].DistMin = 0.3;
Field[4].DistMax = 0.5;
Field[5] = Min;
Field[5].FieldsList = {2,4};
Background Field = 5;
Because only when both threshold fields have the same LcMax value I get
2 circles around the attractor point. If I use the above posted values
the general mesh denstiy is way to high and there is only one circle in
the middle.
Does anybody know what the right gmsh semantics for my problem are?
kind regards
Moritz
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//begin "my example"
lowPr = 0.1;
Point(1) = {0,0,0,lowPr};
Point(2) = {1,0,0,lowPr};
Point(3) = {1,1,0,lowPr};
Point(4) = {0,1,0,lowPr};
Point(5) = {0.5,0.5,0,0};
// points to see where the DistMax and DistMin are
Point(6) = {0.05+0.5,0.5,0,lowPr};
Point(7) = {0.2+0.5,0.5,0,lowPr};
Point(8) = {0.3+0.5,0.5,0,lowPr};
Point(9) = {0.5+0.5,0.5,0,lowPr};
Line(1) = {1,2};
Line(2) = {2,3};
Line(3) = {3,4};
Line(4) = {4,1};
Line Loop(5) = {1,2,3,4};
Plane Surface(6) = {5};
Field[1] = Attractor;
Field[1].NodesList = {5};
Field[2] = Threshold;
Field[2].IField = 1;
Field[2].LcMin = 0.001;
Field[2].LcMax = 0.005;
Field[2].DistMin = 0.05;
Field[2].DistMax = 0.2;
Field[3] = Attractor;
Field[3].NodesList = {5};
Field[4] = Threshold;
Field[4].IField = 3;
Field[4].LcMin = 0.005;
Field[4].LcMax = 0.1;
Field[4].DistMin = 0.3;
Field[4].DistMax = 0.5;
Field[5] = Min;
Field[5].FieldsList = {2,4};
Background Field = 5;
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