Elmer Discussion Forum

hi, i use air(room temperature) as material, so a heat expansion coefficient is set. i know that it makes no sense, it was just my fault that i set both. because of the fact that the results look good, i think the boussinesq takes effect and the perfect gas law not, so my simulation is incompressibl...

hi, i simulate a coupled navier-stokes/heat equation problem. and i set two settings (my fault) which i thought cant be at the same time. for the material i set perfect gas as compressibility model. and as a body force i set boussinesq = true. now my question is: is one of them dominant in the calcu...

hi peter, you are right with modelling a real hand with all the stuff needed is really hard and i dont need the thermal modell of the hand for my simulations. the only reason is that i want to try different heat transfer coefficients (HTC) at the boundary of my hand. we have a climatized room with a...

hi, i am still fighting with my problems with the heat transfer coefficient. i tested alot but the problem stays the same. Trying to add value to nonexistent matrix element: 2000 2033 -1.75000000000000004E-003 Trying to add value to nonexistent matrix element: 2000 2032 -8.75000000000000127E-004 Try...

hi peter,

i used this:

ElmerGrid 2 2 mesh -discont 2

to get the nodes! so there must be another problem.

martin

hi, i have some questions about my Navier-Stokes + Heat simulation. i have modelled two bodies, one is my room with air as material and the other my constant heat source. At the connecting boundary i want to test differnet heat transfer coefficients. I've read in an other thread that i have to doubl...

hi,

after sketching it with lines, have you defined faces?
when you send me your salome file i can have a closer look on your file!

martin

hi,

my salome creates also dots in the files and everything is fine.
you cannot load the unv file directly into elmer. you have to use --> ElmerGrid 8 2 yourfile.unv -autoclean in console.
this command creates the .mesh files which can be loaded into ElmerGui via load mesh.

regards
martin

hi, is there an error message from Elmer? have you used --> ElmerGrid 8 2 myfile.unv -autoclean and maybe it helps when you create in geometry- and mesh-module groups. than you dont have to divide edges or surfaces. it is described here: http://www.elmerfem.org/wiki/index.php/Multiple_bodies_from_Sa...

hi, the complete different result from both meshes, came from different scales. in GiD i build my mesh in range of x=0 to x=5 and in Salome i build it in range of x=0 to x=500!!! the results of the Salome mesh look more realistic than the result of the GiD mesh. so my question is: can i use 1 as a m...