2D:DefiningTheComponentAndTheNumericalGrid - Versionsgeschichte

Len am 26. Mai 2008 um 13:47 Uhr

2008-05-26T13:47:45Z

Len: hat „DefiningTheComponentAndTheNumericalGrid.htm“ nach „2D:DefiningTheComponentAndTheNumericalGrid“ verschoben

2008-05-26T13:16:54Z

hat „DefiningTheComponentAndTheNumericalGrid.htm“ nach „2D:DefiningTheComponentAndTheNumericalGrid“ verschoben

← Nächstältere Version	Version vom 26. Mai 2008, 15:16 Uhr
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Len: /* Defining the Component and the Numerical Grid */

2008-05-26T13:16:05Z

Defining the Component and the Numerical Grid

Len: /* Defining the Component and the Numerical Grid */

2008-05-09T09:10:24Z

Defining the Component and the Numerical Grid

← Nächstältere Version		Version vom 9. Mai 2008, 11:10 Uhr
Zeile 47:		Zeile 47:
	[[Background.htm \| Background]], details of how to set up a manual grid		[[Background.htm \| Background]], details of how to set up a manual grid
	are described in the help topic for the		are described in the help topic for the
	[[DialogGeometry.htm \| Geometry dialog]].		[[DialogGeometry.htm \| "Geometry" dialog]].
	</P>		</P>
	<P>		<P>

Len: Die Seite wurde neu angelegt: = Defining the Component and the Numerical Grid =
In a first step you define the geometry of the component by assembling it from rectangular elements, then y...

2008-05-09T07:21:06Z

Die Seite wurde neu angelegt: = Defining the Component and the Numerical Grid = In a first step you define the geometry of the component by assembling it from rectangular elements, then y...

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= Defining the Component and the Numerical Grid =

In a first step you define the geometry of the component by assembling it from
rectangular elements, then you subdivide it into small numerical grid elements.


The [[DialogGeometry.htm | definition of the geometry]] is done interactively
in a graphical diagram of the component.


The transport equations cannot be solved analytically. To allow a numerical treatment,
the building component must be divided into discrete grid elements. WUFI can
[[DialogGrid.htm | automatically generate]] a general-purpose grid which
will suffice for most cases (you can select one of three degrees of fineness for the grid).


In special cases (e.g. severe interstitial condensation in a narrow region) you
may need to adapt the grid manually. You can easily set up and manually edit
the grid by using WUFI's grid editor. All grid data are entered into a table where
each line represents a layer of the component in x- or y-direction. Each layer
is subdivided into two sublayers with expanding and contracting grid elements. You
may define expanding or contracting grids in order to tailor the local fineness
of the grid to the demands of the simulation model:


For the discretisation of the transport equations, the values of the calculated
quantities are assumed to be constant across each grid element. Therefore, the size
of each element should be chosen so as to make this assumption approximately valid,
depeding on the local conditions. In general, this requires the use of small elements
in regions where steep moisture or temperature gradients are to be expected,
and allows the use of larger elements in more placid regions to cut down on
calculation effort.


In general, steep gradients are to be expected close to the boundaries of a layer,
i.e., close to the surfaces of the component because of the influence of climate
conditions, and close to internal layer interfaces because of condensation. Less
variation will occur in the middle of each layer. 
The two sublayers of each layer may have different
[[DialogGrid.htm | expansion factors]] (>1, <1) for
the grid and thus allow you to achieve a smooth, not necessarily symmetrical,
expansion and contraction of the grid elements which can be adapted to the
requirements in each individual layer.


The choice of a suitable grid is further discussed in the topic
[[Background.htm | Background]], details of how to set up a manual grid
are described in the help topic for the
[[DialogGeometry.htm | Geometry dialog]].


Finally you
[[DialogMaterials.htm | specify the material data]] for each layer.
The material data need not
be entered by hand if the material in question is contained in WUFI's
[[DialogMaterialDatabase.htm | material database]]. Just select the
material in the database and transfer all the data.


WUFI comes complete with a database which offers a selection of materials for
instant use. (Please note, however, that due to large variations in the materials
and often incomplete or inconsistent literature data, the data provided here should
not be taken as divine revelations. They are just intended to give you a starting
point.) 
You can supplement the database with your own materials.

← Nächstältere Version		Version vom 26. Mai 2008, 15:47 Uhr
Zeile 5:		Zeile 5:
	</P>		</P>
	<P>		<P>
	The [[~~Dialog~~:~~Geometry~~ \| definition of the geometry]] is done interactively		The [[2D:Dialog_Geometry \| definition of the geometry]] is done interactively
	in a graphical diagram of the component.		in a graphical diagram of the component.
	</P>		</P>
Zeile 11:		Zeile 11:
	The transport equations cannot be solved analytically. To allow a numerical treatment,		The transport equations cannot be solved analytically. To allow a numerical treatment,
	the building component must be divided into discrete grid elements. WUFI can		the building component must be divided into discrete grid elements. WUFI can
	[[~~Dialog~~:~~Grid~~ \| automatically generate]] a general-purpose grid which		[[2D:Dialog_Grid \| automatically generate]] a general-purpose grid which
	will suffice for most cases (you can select one of three degrees of fineness for the grid).		will suffice for most cases (you can select one of three degrees of fineness for the grid).
	</P>		</P>
Zeile 38:		Zeile 38:
	variation will occur in the middle of each layer.<BR>		variation will occur in the middle of each layer.<BR>
	The two sublayers of each layer may have different		The two sublayers of each layer may have different
	[[~~Dialog~~:~~Grid~~ \| expansion factors]] (>1, <1) for		[[2D:Dialog_Grid \| expansion factors]] (>1, <1) for
	the grid and thus allow you to achieve a smooth, not necessarily symmetrical,		the grid and thus allow you to achieve a smooth, not necessarily symmetrical,
	expansion and contraction of the grid elements which can be adapted to the		expansion and contraction of the grid elements which can be adapted to the
Zeile 47:		Zeile 47:
	[[Details:Numerics \| Background]], details of how to set up a manual grid		[[Details:Numerics \| Background]], details of how to set up a manual grid
	are described in the help topic for the		are described in the help topic for the
	[[~~Dialog~~:~~Geometry~~ \| "Geometry" dialog]].		[[2D:Dialog_Geometry \| "Geometry" dialog]].
	</P>		</P>
	<P>		<P>
	Finally you		Finally you
	[[~~Dialog~~:~~Materials~~ \| specify the material data]] for each layer.		[[2D:Dialog_Materials \| specify the material data]] for each layer.
	The <B>material data</B> need not		The <B>material data</B> need not
	be entered by hand if the material in question is contained in WUFI's		be entered by hand if the material in question is contained in WUFI's
	[[~~Dialog~~:~~MaterialDatabase~~ \| material database]]. Just select the		[[2D:Dialog_MaterialDatabase \| material database]]. Just select the
	material in the database and transfer all the data.		material in the database and transfer all the data.
	</P>		</P>

2D:DefiningTheComponentAndTheNumericalGrid - Versionsgeschichte

Len am 26. Mai 2008 um 13:47 Uhr

Len: hat „DefiningTheComponentAndTheNumericalGrid.htm“ nach „2D:DefiningTheComponentAndTheNumericalGrid“ verschoben

Len: /* Defining the Component and the Numerical Grid */

Len: /* Defining the Component and the Numerical Grid */

Len: Die Seite wurde neu angelegt: = Defining the Component and the Numerical Grid = In a first step you define the geometry of the component by assembling it from rectangular elements, then y...

Len: Die Seite wurde neu angelegt: = Defining the Component and the Numerical Grid =
In a first step you define the geometry of the component by assembling it from rectangular elements, then y...