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# scaling
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Convert quantities between model and prototype scale using Froude similarity.
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## Installation
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```
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pip install git+http://git.wrl.unsw.edu.au:3000/danh/scaling.git
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```
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## Usage
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```sh
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>>> from scaling import Froude
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>>> froude = FroudeConverter()
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>>> # Convert model value of 200 mm to prototype value (m) with scale of 10
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>>> froude.model_to_proto(200, length_scale=10, input_unit='mm', target_unit='m')
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2.0
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>>> # Get Froude scaling exponent for quantities of time
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>>> froude.scaling_exponent('s')
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0.5
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>>> # Get length, mass and time dimensions for quantities of force
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>>> froude.dimensions('N')
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'L^1 M^1 T^-2'
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```
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`scaling` uses `pint` for unit and dimension conversions. `pint` is able to interpret a wide range of different input units.
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```sh
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>>> # Convert water head model value (mm) to prototype pressure value (kPa)
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>>> froude.model_to_proto(10, length_scale=100, 'mm.H20', 'kPa')
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9.80665
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>>> # Make sure gravity remains constant in Froude scaling
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>>> froude.proto_to_model(1, 10, 'gravity', 'meter/second/second')
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9.80665
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```
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