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--- wiki:sns:intactgh:surface_loads [2022/07/25 08:32] – created - external edit 127.0.0.1
+++ wiki:sns:intactgh:surface_loads [2024/08/21 09:07] (current) – [Pressure] goldy
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+{{ :wiki:sns:intactgh:stress_block_loads.png?150 }}
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-A "Pressure" load is a surface load specified in terms of force per unit area. Positive pressures push into the surface, negative pressure pull.
+A "Pressure" load is a surface load specified in terms of force per unit area that is normal to the surface. Positive pressures push into the surface, negative pressure pull.
 A Pressure Load requires two inputs:
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+{{ :wiki:sns:snsgrasshopper:pressure_load.png?200 }}
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-===== Hydrostatic =====
+===== Torque =====
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-A "Hydrostatic" load is a spatially varying pressure due to immersion in a liquid.  The pressure at any point depends on the density of the liquid, increasing from a value of zero at the liquid surface to a maximum at the deepest point.  An example of this load is the pressure applied by water to the hull of a floating boat.
+A "Torque" load is a surface load that applies a twisting force around an axis. The direction of the torque is determined using the right hand rule: using your right hand, point your thumb in the direction of the axis. A positive torque value applies a torque acting in the direction the fingers of your right hand would wrap around the axis. The torque load is applied among the load faces with a distribution that varies linearly from zero at the axis.
-A Hydrostatic load requires three inputs:
+A Torque load requires three inputs:
-  * the geometry of the surface where the load is applied
+  * the geometry of the surfaces where the load is applied
-  * the plane of the liquid surface (parallel to XY plane)
+  * the axis of the torque (a line segment)
-  * the density of the fluid imparting the load
+  * the value of the torque
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+{{ :wiki:sns:snsgrasshopper:torque_load.png?200 }}
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-===== Torque =====
+===== Hydrostatic Load =====
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-A "Torque" load is a surface load that applies a twisting force around an axis. The direction of the torque is determined using the right hand rule: using your right hand, point your thumb in the direction of the axis. A positive torque value applies a torque acting in the direction the fingers of your right hand would wrap around the axis. The torque load is applied among the load faces with a distribution that varies linearly from zero at the axis.
+A “Hydrostatic” load is a spatially varying pressure as experienced by the walls of a pool due to the weight of the water pressing against them. The pressure at any point depends on the density of the water, increasing from a value of zero at the water surface to a maximum at the deepest point.
-A Torque load requires three inputs:
+A Hydrostatic load requires three inputs:
   * the geometry of the surfaces where the load is applied
-  * the axis of the torque (a line segment)
+  * a point on the surface of the fluid (fluid depth is assumed in the -Z direction)
-  * the value of the torque.
+  * specific gravity of the fluid (dimensionless, SG = 1 for water)
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+{{ :wiki:sns:intactgh:hydrostatic_load_block.png?200 }}
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