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Showing results 1 to 11 of 11 Search took 0.00 seconds. Search: Posts Made By: alberto

Forum: OpenFOAM Running, Solving & CFD September 9, 2011, 15:20

Replies: 28 Convergence in OpenFoam Views: 31,104 Posted By alberto If you specify a convergence criterion, the... If you specify a convergence criterion, the solver will stop automatically. Best,

Forum: OpenFOAM Running, Solving & CFD September 8, 2011, 16:58

Replies: 28 Convergence in OpenFoam Views: 31,104 Posted By alberto The "search" function is always your friend... The "search" function is always your friend ;-)

Forum: OpenFOAM Running, Solving & CFD June 25, 2011, 16:21

Replies: 28 Convergence in OpenFoam Views: 31,104 Posted By alberto Machine zero (or machine epsilon... Machine zero (or machine epsilon http://en.wikipedia.org/wiki/Machine_epsilon ) depends on the machine. As reference, 1.0 x 10^-12 is what I use as reference. Someone uses smaller numbers. Best,

Forum: OpenFOAM Running, Solving & CFD June 23, 2011, 11:38

Replies: 28 Convergence in OpenFoam Views: 31,104 Posted By alberto The "Final" option in linear solvers is used only... The "Final" option in linear solvers is used only for the last iteration, but you will see "pd" in the log anyway. You are using a PISO approach, so the residuals don't tell you a lot on the...

Forum: OpenFOAM Running, Solving & CFD December 23, 2010, 02:13

Replies: 28 Convergence in OpenFoam Views: 31,104 Posted By alberto It depends. I usually have at least 0.001 for U,... It depends. I usually have at least 0.001 for U, k, epsilon and other secondary variables, but I want a better convergence of p (0.0001 at least), and I check the mass conservation (which should be...

Forum: OpenFOAM Running, Solving & CFD December 23, 2010, 01:53

Replies: 28 Convergence in OpenFoam Views: 31,104 Posted By alberto Perfect. You can use pisoFoam without any... Perfect. You can use pisoFoam without any problem, and since your mesh will be probably very good since you do LES and DNS, you probably won't need orthogonal correctors (Check with 3, and look at...

Forum: OpenFOAM Running, Solving & CFD December 23, 2010, 01:22

Replies: 28 Convergence in OpenFoam Views: 31,104 Posted By alberto To answer I would need to know what level of... To answer I would need to know what level of accuracy you need. Do you need a steady state solution, a time resolved solution? Are you doing LES? Let me give some guideline. Your case is quite...

Forum: OpenFOAM Running, Solving & CFD April 9, 2010, 14:56

Replies: 28 Convergence in OpenFoam Views: 31,104 Posted By alberto Usually in unsteady runs the criterion is fixed... Usually in unsteady runs the criterion is fixed to 1e-3 in commercial codes. It doesn't mean much, but it gives you an indication of what to expect. Best,

Forum: OpenFOAM Running, Solving & CFD April 9, 2010, 13:34

Replies: 28 Convergence in OpenFoam Views: 31,104 Posted By alberto Yes, in principle this should be verified at each... Yes, in principle this should be verified at each time-step. What is your Courant number? You could use pimpleFoam instead than pisoFoam to be able to perform sub-iterations (outer...

Forum: OpenFOAM Running, Solving & CFD April 9, 2010, 12:15

Replies: 28 Convergence in OpenFoam Views: 31,104 Posted By alberto Yes, you have to monitor the initial residual. In... Yes, you have to monitor the initial residual. In steady-state simulations it's easy to just fix a very restrictive requirement and check when the residuals stop changing after for a long number of...

Forum: OpenFOAM Running, Solving & CFD March 6, 2010, 02:14

Replies: 28 Convergence in OpenFoam Views: 31,104 Posted By alberto Hi, I answer at your second question first.... Hi, I answer at your second question first. OpenFOAM(r) is mainly a library that allows CFD applications and tools to be written with a high level syntax. The OF distribution contains many...

Showing results 1 to 11 of 11

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