Ivar KJELBERG
COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted:
1 decade ago
Apr 9, 2012, 1:10 p.m. EDT
Hi
are you in 2D, or 2D axi or ... ? you can also, if the default meshing does not give you what you want, start to mesh a boundary and sweep it over the domain(s)
--
Good luck
Ivar
Hi
are you in 2D, or 2D axi or ... ? you can also, if the default meshing does not give you what you want, start to mesh a boundary and sweep it over the domain(s)
--
Good luck
Ivar
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Posted:
1 decade ago
Apr 9, 2012, 1:28 p.m. EDT
It's hard to tell as you don't provide enough details about your structure. But generally, you can mesh the short edge and then sweep along the long one. Also for thin layers square mesh usually works better than triangular
It's hard to tell as you don't provide enough details about your structure. But generally, you can mesh the short edge and then sweep along the long one. Also for thin layers square mesh usually works better than triangular
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Posted:
1 decade ago
Apr 10, 2012, 12:23 p.m. EDT
hi
my mesh is 2D, but i want to know the scale geometry with dimensions 1m (longe) y and 0.017 m (witdth).
this dimensions are a quad
hi
my mesh is 2D, but i want to know the scale geometry with dimensions 1m (longe) y and 0.017 m (witdth).
this dimensions are a quad
Ivar KJELBERG
COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
Please login with a confirmed email address before reporting spam
Posted:
1 decade ago
Apr 10, 2012, 1:43 p.m. EDT
Hi
I havent used 3.5 for a very long time, but if you have a rectangle 1m in X and 17 mm in Y then if you mesh it by default you will certainly get one element height (along Y) and a few dozen along the 1m length. There is somewhere an option to scale/stretch the geometry, you can use a factor 50 for Y, then your geometry will be virtually expanded 50 times, you will see the mesher make a more or less regular mesh, and then it will contract the result 50 time along Y. The result is a very low quality mesh per say, but could certainly be OK to catch steep gradient along Y.
But if your geoemtry is a rectangle, you can as well add a dimension along the two short Y dges and mesh first these adges with say 25-50 elements, and then add a quad on the domain you will get the same result.
Another way to get a fine mesh along an edge where you have a large gradient (time solveing HT cases) is to use a boundary mesh, check the doc
--
Good luck
Ivar
Hi
I havent used 3.5 for a very long time, but if you have a rectangle 1m in X and 17 mm in Y then if you mesh it by default you will certainly get one element height (along Y) and a few dozen along the 1m length. There is somewhere an option to scale/stretch the geometry, you can use a factor 50 for Y, then your geometry will be virtually expanded 50 times, you will see the mesher make a more or less regular mesh, and then it will contract the result 50 time along Y. The result is a very low quality mesh per say, but could certainly be OK to catch steep gradient along Y.
But if your geoemtry is a rectangle, you can as well add a dimension along the two short Y dges and mesh first these adges with say 25-50 elements, and then add a quad on the domain you will get the same result.
Another way to get a fine mesh along an edge where you have a large gradient (time solveing HT cases) is to use a boundary mesh, check the doc
--
Good luck
Ivar
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Posted:
1 decade ago
May 26, 2012, 9:27 a.m. EDT
hello, i have problem
i having a simulation of heat pipe high temperature
after, i run my simulation and result a expresion " undefined value comand ", there are 141 gradees of freedown . giving NaN/ inf. in the vector of variable w sodio.
i can not understand this
Thanks for attention
hello, i have problem
i having a simulation of heat pipe high temperature
after, i run my simulation and result a expresion " undefined value comand ", there are 141 gradees of freedown . giving NaN/ inf. in the vector of variable w sodio.
i can not understand this
Thanks for attention
Ivar KJELBERG
COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
Please login with a confirmed email address before reporting spam
Posted:
1 decade ago
May 26, 2012, 9:36 a.m. EDT
Hi
that mostly means there are not enough BCs to give an unique solution, recheck carefully your model to see if all physics and dependent variables have enough boundary settings
--
Good luck
Ivar
Hi
that mostly means there are not enough BCs to give an unique solution, recheck carefully your model to see if all physics and dependent variables have enough boundary settings
--
Good luck
Ivar