# A basic doubt on reading the iteration results

 Register Blogs Members List Search Today's Posts Mark Forums Read

 July 16, 2008, 08:28 Dear Mr.Tammo, Thank you ve #1 New Member   Hari Krishnan Join Date: Mar 2009 Location: chennai, Tamil nadu, india Posts: 27 Rep Power: 10 Sponsored Links Dear Mr.Tammo, Thank you very much for your reply. I did it with uniform conditions itself. I had seen user guide for many of my doubts. Its very brief as I look in OpenFOAM site. I need another one basic clarification to know how to read the iteration results and what does the residuals actually mean. We are calculating the flow rate of a valve. In inlet 7000 Pa is given and outlet is 0Pa and we fixed outlet pressurised condition to both inlet and outlet. after running the simple foam i am getting these results. Time = 1 DILUPBiCG: Solving for Ux, Initial residual = 1, Final residual = 1.49213e-05, No Iterations 1 DILUPBiCG: Solving for Uy, Initial residual = 0, Final residual = 0, No Iterations 0 DILUPBiCG: Solving for Uz, Initial residual = 0, Final residual = 0, No Iterations 0 GAMG: Solving for p, Initial residual = 1, Final residual = 0.000601879, No Iterations 6 time step continuity errors : sum local = 2.18714, global = -0.0619567, cumulative = -0.0619567 DILUPBiCG: Solving for epsilon, Initial residual = 0.897335, Final residual = 1.02147e-05, No Iterations 1 DILUPBiCG: Solving for k, Initial residual = 1, Final residual = 1.38556e-05, No Iterations 1 ExecutionTime = 0.77 s ClockTime = 1 s Time = 2 DILUPBiCG: Solving for Ux, Initial residual = 0.00335051, Final residual = 4.38432e-08, No Iterations 1 DILUPBiCG: Solving for Uy, Initial residual = 0.00397104, Final residual = 4.84344e-08, No Iterations 1 DILUPBiCG: Solving for Uz, Initial residual = 0.00331844, Final residual = 4.17761e-08, No Iterations 1 GAMG: Solving for p, Initial residual = 0.943068, Final residual = 0.000466685, No Iterations 14 time step continuity errors : sum local = 0.500458, global = -0.060284, cumulative = -0.122241 DILUPBiCG: Solving for epsilon, Initial residual = 0.862161, Final residual = 1.21649e-05, No Iterations 1 DILUPBiCG: Solving for k, Initial residual = 0.842201, Final residual = 1.88649e-05, No Iterations 1 ExecutionTime = 1.24 s ClockTime = 1 s Time = 3 DILUPBiCG: Solving for Ux, Initial residual = 0.147196, Final residual = 2.8822e-06, No Iterations 1 DILUPBiCG: Solving for Uy, Initial residual = 0.112165, Final residual = 1.96374e-06, No Iterations 1 DILUPBiCG: Solving for Uz, Initial residual = 0.138183, Final residual = 2.76485e-06, No Iterations 1 GAMG: Solving for p, Initial residual = 0.631318, Final residual = 0.000284522, No Iterations 6 time step continuity errors : sum local = 2.06408, global = -0.124974, cumulative = -0.247215 DILUPBiCG: Solving for epsilon, Initial residual = 0.863321, Final residual = 1.39978e-05, No Iterations 1 DILUPBiCG: Solving for k, Initial residual = 0.813142, Final residual = 2.10478e-05, No Iterations 1 ExecutionTime = 1.62 s ClockTime = 1 s I did the iteration to 300 time and input the 300 time to 0th time, Could you educate me about the basic questions below? what does this paragraph mean? What to calculate actually from this paragraph? What for the residuals stand and how to interpret the values from it? I could not found out the details in users manual. it would be helpful for me if you advice the regard. Thank you V.Hari

 Thread Tools Display Modes Linear Mode

 Posting Rules You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is OffTrackbacks are On Pingbacks are On Refbacks are On Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post Fluent learner FLUENT 16 May 30, 2008 04:09 JACK HARI FLUENT 0 December 22, 2007 02:35 Guillermo Marraco Main CFD Forum 5 March 10, 2007 07:38 sak FLUENT 0 September 6, 2005 23:16 Quarkz Main CFD Forum 7 July 21, 2005 14:17