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Editing v0.34:Pressure
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{{quality|Exceptional|16:12, 26 December 2011 (UTC)}}{{av}} | {{quality|Exceptional|16:12, 26 December 2011 (UTC)}}{{av}} | ||
− | + | Dwarf Fortress features some pretty complex behavior in an attempt to simulate '''fluid mechanics'''. One aspect of this behavior is seen in the form of '''pressure'''. The basic idea here is quite simple - certain forms of '''[[flow|fluids]]''' movement exert '''pressure''', causing them to potentially move ''upwards'' into other areas. | |
− | Dwarf Fortress features some pretty complex behavior in an attempt to simulate '''fluid mechanics'''. One aspect of this behavior is seen in the form of '''pressure'''. The basic idea here is quite simple - certain forms of '''fluids''' movement exert '''pressure''', causing them to potentially move ''upwards'' into other areas. | ||
==Summary== | ==Summary== | ||
− | Contrary to what many people may believe, pressure is '''not''' a property of a body of liquid. Pressure is simply one of 3 rules by which liquids can be moved - the others are | + | Contrary to what many people may believe, pressure is '''not''' a property of a body of liquid. Pressure is simply one of 3 rules by which liquids can be moved - the others are "falling" (when the tile beneath contains less than 7/7 of liquid) and "spreading out" (when the liquid levels of two adjacent tiles are averaged, possibly pushing items around). |
The following types of liquid movement follow the rules of pressure: | The following types of liquid movement follow the rules of pressure: | ||
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==A demonstration of pressure using U-Bends== | ==A demonstration of pressure using U-Bends== | ||
− | A U-Bend is a channel that digs down, and curves back up. With '''pressure''' a fluid will be pushed up the other side of the u-bend. By understanding how pressure works in a u-bend you should be able to adapt this knowledge to use fluids in any configuration you desire without any unexpected surprises that could make life in your fortress more '''[[fun]]''' than anticipated. '''[[Water]]''' and '''[[magma]]''' both behave very differently with regards to pressure, so read carefully. | + | A U-Bend is a channel that digs down, and curves back up. With '''pressure''' a [[flow|fluid]] will be pushed up the other side of the u-bend. By understanding how pressure works in a u-bend you should be able to adapt this knowledge to use fluids in any configuration you desire without any unexpected surprises that could make life in your fortress more '''[[fun]]''' than anticipated. '''[[Water]]''' and '''[[magma]]''' both behave very differently with regards to pressure, so read carefully. |
===Water in a U-Bend=== | ===Water in a U-Bend=== | ||
− | The | + | The following three diagrams demonstrate different ways water might behave in a u-bend. In all three cases, the water source is on the left side of the diagram and water is filling the area to the right. In the first example (Diagram A), we have water taken directly from a (flat) river used to fill a u-bend. In this case, the river is free to flow off the edge of the map, so the only pressure comes from the water tile on the top of the left side (highlighted in green) falling downward (into the tile highlighted in red), so the water on the right side stops one level below the river itself. |
− | + | In the next example (Diagram B), a '''dam''' has been placed, preventing the river from flowing off the edge of the map. In this case, the pressure exerted by the river source (highlighted in red) allows the water to fill up the remaining level of the u-bend. Use caution when placing a dam on your river. | |
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− | In the next example (Diagram B), a '''dam''' has been placed, preventing the river from flowing off the edge of the map. In this case, the pressure exerted by the river source (highlighted in red) allows the water to fill up the remaining level of the u-bend. Use caution when placing a dam on your river | ||
The final example (Diagram C), demonstrates how a '''[[pump|screw pump]]''' exerts pressure - in this case, the water fills up to the same level as the pump's output tile (highlighted in red). | The final example (Diagram C), demonstrates how a '''[[pump|screw pump]]''' exerts pressure - in this case, the water fills up to the same level as the pump's output tile (highlighted in red). | ||
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▓▓▓▓▓▓▓}} | ▓▓▓▓▓▓▓}} | ||
| {{diagram|spaces=yes|\ | | {{diagram|spaces=yes|\ | ||
− | ▓[#00F][#800]≈[#00F][#800]≈[#00F][#800]≈[#00F][#800]≈[#00F | + | ▓[#00F][#800]≈[#00F][#800]≈[#00F][#800]≈[#00F][#800]≈[#00F]≈▓[#00F]≈[#00F]≈[#00F]≈▓ |
▓▓▓▓▓[#00F]≈▓[#00F]≈[#00F]≈[#00F]≈▓ | ▓▓▓▓▓[#00F]≈▓[#00F]≈[#00F]≈[#00F]≈▓ | ||
▓[#00F]≈▓[#00F]≈[#00F]≈[#00F]≈▓ | ▓[#00F]≈▓[#00F]≈[#00F]≈[#00F]≈▓ | ||
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==Neutralizing Pressure== | ==Neutralizing Pressure== | ||
− | There are | + | There are two methods for neutralizing fluid pressure: diagonal connections and screw pumps. Knowing how to manipulate pressure as needed allows you to quickly move fluids wherever you wish in your fortress allowing you to build things a dwarf can be proud of. |
===Diagonal Flow=== | ===Diagonal Flow=== | ||
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'''Top View''' | '''Top View''' | ||
− | + | ▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒ | |
− | > > > | + | > > > ▒ > > > |
− | 4Z | + | 4Z Deep ▒ 1Z Deep |
− | > > > | + | > > > ▒ > > > |
− | + | ▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒ | |
'''Side View''' <br /> | '''Side View''' <br /> | ||
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Do note that the screw pump '''will''' still exert pressure when filling the pool, but said pressure will be independent of the source and can be subsequently blocked by diagonal gaps. | Do note that the screw pump '''will''' still exert pressure when filling the pool, but said pressure will be independent of the source and can be subsequently blocked by diagonal gaps. | ||
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==Hatches== | ==Hatches== | ||
− | [[Hatch cover|Hatches]] can be placed over [[channel]]s, [[stair]]s, [[ramp]]s, etc. to prevent [[water]] from moving vertically but will still allow the tile to be used, even as a water source (and possibly still for fishing too). | + | [[Hatch cover|Hatches]] can be placed over [[channel]]s, [[stair]]s, [[ramp]]s, etc. to prevent [[water]] from moving vertically but will still allow the tile to be used, even as a water source (and possibly still for fishing too). |
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== See Also== | == See Also== |