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Old   May 14, 2007, 03:58
Default Newtons method failed(Error)
  #1
Chetan Prashant
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hey all, after giving all coal boundary condition, i got following error drring solver. Please help me to understand this error.

****** Notice ****** | | Newtons method failed to converge in 100 iterations. This | | occurred while computing the following variable: | | | | Variable Name : Temperature | | Location Name : Domain 1 | | Mesh location : VERTICES | | Mesh entity : | | Last 3 Changes : 3.92441E+05 3.92441E+05 3.92441E+05 | | Tolerance : 1.0000E-02 | | | | The Newton iteration was either slowly converging or has stalled. | | The solver will continue with the variable set as it was on the | | final iteration. If this situation continues you might try | | increasing the number of iterations allowed for Newtons method. | | This can be changed by setting one of the parameters: | | | | Temperature : "Constitutive Relation Iteration Limit" | | Pressure : "Newton Pressure Iteration Limit" | | | | for your mixture using the definition file editor. |

Chetan Prashant
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Old   May 14, 2007, 06:16
Default Re: Newtons method failed(Error)
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flga
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Hi Chetan,

it occurs normally when you create a grid in millimeters and forged to scale it to meters in CFX Pre.

flga
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Old   May 15, 2007, 02:56
Default Re: Newtons method failed(Error)
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Chetan Prahsant
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So what should i do to eliminate this error?
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Old   May 15, 2007, 03:05
Default Re: Newtons method failed(Error)
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flga
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To scale down your grid in CFX 11 Pre, right click on your grid on the Outline tree, choose "transform mesh". Than set "transformation" to "scale" and write down the coefficient. On CFX 10 I am not sure, but a look into the manual will do the job.

flga
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Old   May 17, 2007, 00:58
Default Re: Newtons method failed(Error)
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Chetan Prahsant
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helo flga, thanks for ur reply. but i am still fighting with that problem. so i am giving more description about my problem.

I have introduced plates on wall for taking out heat of furnace with help of imprint commend. Initially I had given less negative flux (45-147W/m2) but it that case temp. Inside furnace is higher and no error. When I am giving higher (45000-147000W/m2)heat negative flux, solver is being stopped with error. (Newtons method failed to converge in 100 iterations) please give me ur suggestion.

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