Search found 19 matches

by Antourloupe82
10 Aug 2015, 00:19
Forum: General
Topic: Cooling in air : Heat Transfer and Navier-Stokes
Replies: 25
Views: 21249

Re: Cooling in air : Heat Transfer and Navier-Stokes

Dear Annier, My problem is that I already solved this problem by using comsol or Freefem. It took to me ten minutes... Unfortunately by using Elmer this took to me two months and for the moment enough results... To be clear, I do not know if it is a good idea to continue to use Elmer for this type o...
by Antourloupe82
09 Aug 2015, 21:33
Forum: General
Topic: Cooling in air : Heat Transfer and Navier-Stokes
Replies: 25
Views: 21249

Re: Cooling in air : Heat Transfer and Navier-Stokes

Unfortunately nothing works !
by Antourloupe82
04 Aug 2015, 11:14
Forum: General
Topic: Cooling in air : Heat Transfer and Navier-Stokes
Replies: 25
Views: 21249

Re: Cooling in air : Heat Transfer and Navier-Stokes

Hi Peter,

Thank you for your reply.

The grey inner circle is not missing or detached...It is just the trace of the x-axis in ParaView...See the oblique view in the attachement
VelocityField.jpg
VelocityField.jpg (94.1 KiB) Viewed 4623 times
by Antourloupe82
03 Aug 2015, 23:54
Forum: General
Topic: Cooling in air : Heat Transfer and Navier-Stokes
Replies: 25
Views: 21249

Re: Cooling in air : Heat Transfer and Navier-Stokes

Dear Peter, According your advice, I performed the simulation with a number of element very high for the mesh...The solvers (Heat transfer and Navier-Stokes) converge but the solutions obtained after five hours ares not acceptable : - Again, the temperature field does not vary as a function of the t...
by Antourloupe82
02 Aug 2015, 22:46
Forum: General
Topic: Cooling in air : Heat Transfer and Navier-Stokes
Replies: 25
Views: 21249

Re: Cooling in air : Heat Transfer and Navier-Stokes

MeshFeeCadVSElmer.jpg Hi Peter, Thank you for your reply. In fact, the mesh used is imposed by Elmer...My workflow is quickly : - geometry and mesh created by using FreeCad - Save the previous mesh in the format .stl or .msh - Open .stl in ElmerGUI The mesh created by using FreeCad has 10^4 element...
by Antourloupe82
02 Aug 2015, 11:14
Forum: General
Topic: Cooling in air : Heat Transfer and Navier-Stokes
Replies: 25
Views: 21249

Re: Cooling in air : Heat Transfer and Navier-Stokes

Velocity-Field.jpg Dear Anil, According your advices, I performed the calculation by using a third body (polycarbonate) representing the walls of the room (with thickness = 5mm). The sphere is made of aluminum (Radius = 2.5 cm) and the size of the box is L = 20cm (representing the room). The initia...
by Antourloupe82
31 Jul 2015, 20:25
Forum: General
Topic: Cooling in air : Heat Transfer and Navier-Stokes
Replies: 25
Views: 21249

Re: Cooling in air : Heat Transfer and Navier-Stokes

Hi all, I have tried to perform the calculation by adding a third body (walls with non zero thickness and materiel defined). The solution converges but unfortunately the final solution is not acceptable...The velocity field around the metallic sphere is not acceptable and the temperature does not va...
by Antourloupe82
31 Jul 2015, 13:15
Forum: General
Topic: Cooling in air : Heat Transfer and Navier-Stokes
Replies: 25
Views: 21249

Re: Cooling in air : Heat Transfer and Navier-Stokes

Dear Anier, I looked at the comsol model proposed in the previous post but I feel that this problem is different from mine. In this model, the walls have a finite thickness (e=30cm) with any thermal transferts between inside and outside room. In my case, the walls are infinitely thin and I need to i...
by Antourloupe82
31 Jul 2015, 00:23
Forum: General
Topic: Cooling in air : Heat Transfer and Navier-Stokes
Replies: 25
Views: 21249

Re: Cooling in air : Heat Transfer and Navier-Stokes

Dear All, I used all the advices given in the previous posts to solve my problem. As a reminder, I would like determine the velocity and pressure fields as a function of the time of a small metallic sphere cooling in a large box filled with air. The metallic sphere of radius R=50cm is made of copper...
by Antourloupe82
21 Jul 2015, 20:12
Forum: General
Topic: Running test cases in Windows
Replies: 2
Views: 3205

Running test cases in Windows

Dear all, I need to run the test cases in Windows located is : https://github.com/ElmerCSC/elmerfem/tree/devel/fem/tests/NaturalConvection. There are six files : - CMakeLists.txt - ELMERSOLVER_STARTINFO - Makefile - case.sif - runtest.cmake - square.grd I understand case.sif and square.grd...but I'm...