Search found 26 matches
- 01 Mar 2013, 17:57
- Forum: Software development
- Topic: Find the nodes that belong to a BC
- Replies: 3
- Views: 5638
Re: Find the nodes that belong to a BC
Hi Jean, Just a suggestion: if your mesh file is in the Elmer format (mesh.header, mesh.nodes, mesh.boundary, mesh.elements) just take a look at the mesh.boundary files and to the reference in the ElmerSolver Manual appendix A. If you are familiar with any programming language, you will find easy to...
- 01 Mar 2013, 17:47
- Forum: ElmerSolver
- Topic: k-epsilon coupled with heat transfer
- Replies: 4
- Views: 5254
Re: k-epsilon coupled with heat transfer
Hi Lars, just some comments on the turbulent problem: - The K and epsilon values must be specified only in the inflow boundary and in the initial condition. The wall law (and its laminar counterpart) sets internally proper values for their boundary conditions on walls. - If the simulation is steady,...
- 25 Feb 2013, 15:04
- Forum: General
- Topic: how to call the velocity for using in body force condition
- Replies: 2
- Views: 2730
Re: how to call the velocity for using in body force condition
Hi Sebastien, an example (Reynolds number, 2D, compressible flow, air, ideal gas, Sutherland law for viscosity-temperature relation): Body Force 1 Re_number = Variable Temperature, Pressure, Velocity 1, Velocity 2 Real MATC "(101325+tx(1))/287/tx(0)*sqrt(tx(2)²+tx(3)²)/(1.716e-05*(tx(0)/273.15)...
- 19 Feb 2013, 13:38
- Forum: ElmerSolver
- Topic: natural convection
- Replies: 3
- Views: 4755
Re: natural convection
Hi Supituki,
Elmer Models manual, p.17: http://www.nic.funet.fi/pub/sci/physics ... Manual.pdf
Regards,
Cesar
Elmer Models manual, p.17: http://www.nic.funet.fi/pub/sci/physics ... Manual.pdf
Regards,
Cesar
- 14 Feb 2013, 14:28
- Forum: ElmerSolver
- Topic: K-Epsilon Model
- Replies: 1
- Views: 2710
Re: K-Epsilon Model
Hi Iweb, the KE Clip is a limiter. The turbulent kinetic energy and its dissipation must be positive, so, to ensure it, the following condition is applied to all the nodal values of the variables (KESolver.src, lines 428 to 451): !---------------------------------------------------------------------...
- 04 Feb 2013, 13:19
- Forum: ElmerSolver
- Topic: K-Epsilon convergence issues
- Replies: 1
- Views: 3237
Re: K-Epsilon convergence issues
Hi, some ideas after a first look to your sif file: - You must set the inlet values of the turbulent variables (Kinetic Energy and Kinetic Dissipation), not only its initial values. - The boundary condition for the wall is wrong. You must use a wall law for the K-Epsilon turbulence model, as long as...
- 13 Dec 2012, 19:57
- Forum: ElmerSolver
- Topic: Strange Result using Diffuse Radiation Boundary Condition
- Replies: 15
- Views: 9162
Re: Strange Result using Diffuse Radiation Boundary Condition
Hi all, it seems to me that the colder parts are those elements with, at least, a nonzero viewfactor to some element on the other cylinder, so part of the radiation flux goes to the other cylinder (even a zero net flux if the temperatures are equal) and the rest goes (ideally) to the surroundings. T...
- 15 Nov 2012, 15:30
- Forum: Installation & compilation
- Topic: Recommended BLAS implementation(s)
- Replies: 1
- Views: 3125
Re: Recommended BLAS implementation(s)
Hi,
if you use Linux you can take a look at ATLAS:
http://math-atlas.sourceforge.net/
Debian and Ubuntu (and all major distros, I suppose) have ATLAS packages. A custom compilation will perform even better (and will let you choose between serial and threaded libs).
Regards,
Cesar
if you use Linux you can take a look at ATLAS:
http://math-atlas.sourceforge.net/
Debian and Ubuntu (and all major distros, I suppose) have ATLAS packages. A custom compilation will perform even better (and will let you choose between serial and threaded libs).
Regards,
Cesar
- 07 Nov 2012, 18:22
- Forum: ElmerSolver
- Topic: Treatment of open radiation boundaries
- Replies: 4
- Views: 3800
Re: Treatment of open radiation boundaries
Hi carsten, when the radiation exchange takes place into an open enclosure you can use the keywords: Radiation Boundary Open = Logical True Radiation External Temperature = Real xxxx The first one avoids the normalization of the view factors (as long as an angle fraction is lost for some or all of t...
- 07 Nov 2012, 11:33
- Forum: ElmerSolver
- Topic: GebhardtFactors binary
- Replies: 2
- Views: 2535
Re: GebhardtFactors binary
Hi Peter, thank you very much. That was what I supposed. If someone cares, the segmentation fault disappears changing the line 132 of the GebhardtFactors.src file. Where it says: Model => LoadModel( ModelName,.FALSE. ) it must say: Model => LoadModel( ModelName,.FALSE.,1,0 ) Besides, this stand-alon...