Barbara: /* Setting Numerical Parameters */

2009-03-10T11:35:55Z

Setting Numerical Parameters

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	* You may switch off [[1D:Dialog_Numerics \| <B>latent heat</B>]] effects (heat of fusion and/or heat of evaporation) to examine the extent to which they affect the results. <br>		* You may switch off [[1D:Dialog_Numerics \| <B>latent heat</B>]] effects (heat of fusion and/or heat of evaporation) to examine the extent to which they affect the results. <br>

	In case WUFI reports ~~<B>~~problems~~</B>~~ with the accuracy of the results, you should tune WUFI to [[1D:Dialog_Numerics \| stricter convergence criteria or stronger underrelaxation]], sacrificing some calculation speed. <br>		In case WUFI reports problems with the accuracy of the results, you should tune WUFI to [[1D:Dialog_Numerics \| stricter convergence criteria or stronger underrelaxation]], sacrificing some calculation speed. <br>

	Possible numerical problems and countermeasures are further discussed in the on-line help for the [[1D:Dialog_InfoLastCalculationRun \| dialog "Status of Last Calculation"]] and in [[Discussion:WUFI-Pro_PerformanceandLimitations \| WUFI's Performance and Limitations]].		Possible numerical problems and countermeasures are further discussed in the on-line help for the [[1D:Dialog_InfoLastCalculationRun \| dialog "Status of Last Calculation"]] and in [[Discussion:WUFI-Pro_PerformanceandLimitations \| WUFI's Performance and Limitations]].

Len: Die Seite wurde neu angelegt: = Setting Numerical Parameters =
There are some parameters controlling the numerical aspects of the calculation:
* You must specify a suitable [[1D:Dialog_Time...

2008-08-13T06:43:17Z

Die Seite wurde neu angelegt: = Setting Numerical Parameters = There are some parameters controlling the numerical aspects of the calculation: * You must specify a suitable [[1D:Dialog_Time...

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= Setting Numerical Parameters =

There are some parameters controlling the numerical aspects of the calculation:

* You must specify a suitable [[1D:Dialog_Time | time step]]. A time step of one hour is adequate for most cases (the choice of time steps is further discussed in [[Discussion:WUFI-Pro_PerformanceandLimitations | WUFI's Performance and Limitations]]).

* For special purposes, you may exclude either [[1D:Dialog_Numerics | heat or moisture transport]] from the calculations. For example, you may thus easily determine the thermal transmittance of a wall with a complicated moisture distribution: specify the distribution as the [[1D:Dialog_InitialConditions | initial moisture profile]] and prevent it from spreading by turning off moisture transport. Perform a calculation with constant climate, applying a suitable temperature gradient across the assembly until steady-state conditions are reached and analyse the resulting heat flow.

* You may also switch off [[1D:Dialog_Numerics | capillary conduction]] only, in order to examine the importance of the remaining vapour diffusion.

* You may switch off [[1D:Dialog_Numerics | latent heat]] effects (heat of fusion and/or heat of evaporation) to examine the extent to which they affect the results. 

In case WUFI reports problems with the accuracy of the results, you should tune WUFI to [[1D:Dialog_Numerics | stricter convergence criteria or stronger underrelaxation]], sacrificing some calculation speed. 

Possible numerical problems and countermeasures are further discussed in the on-line help for the [[1D:Dialog_InfoLastCalculationRun | dialog "Status of Last Calculation"]] and in [[Discussion:WUFI-Pro_PerformanceandLimitations | WUFI's Performance and Limitations]].

1D:SettingTheNumericalParameters - Versionsgeschichte

Barbara: /* Setting Numerical Parameters */

Len: Die Seite wurde neu angelegt: = Setting Numerical Parameters = There are some parameters controlling the numerical aspects of the calculation: * You must specify a suitable [[1D:Dialog_Time...

Len: Die Seite wurde neu angelegt: = Setting Numerical Parameters =
There are some parameters controlling the numerical aspects of the calculation:
* You must specify a suitable [[1D:Dialog_Time...