3.2.1 Quantity Initialization

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Several methods are possible to initialize a quantity:

initialization of the quantity throughout the whole mesh with a constant value:
```
Value(<QuantityName>) = <const>
```
initialization of the quantity with a distributed analytical user definable function:
```
Value(<QuantityName>) = Analytical <function(X,Y,Z,t,other quantities)>
```
the quantity will be initialized with a distributed attribute defined on the given source file (no interpolation is necessary)
```
Value(<QuantityName>) = Read <attribute defined in the source>
```
the quantity will be initialized with a distributed attribute defined on any other grid and needs to be interpolated depending on the scaling factor of the quantity
```
Value(<QuantityName>) = Read(<physical>,<logical>) <attribute>
```

M. Radi, E.Leitner, and S. Selberherr