Correct the SSPquadUP argument descriptions - #197
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The page described $alpha as a 1 - Ks/Kf parameter and the four trailing arguments as boundary pore pressures. In the code, alpha scales the pressure stabilization matrix, for which the element's authors recommend 0.25h^2/(rho c^2), and Pup, Plow, Pleft and Pright are normal tractions on the solid, positive outward, applied in full rather than through a load pattern. The permeabilities act along the global axes, as hydraulic conductivity over the unit weight of the fluid. The recorder note listed force and material $matNum, neither of which the element answers. It now lists stress2D3, strain2D3 and the queries passed on to the material, and states that the pore pressure is the velocity response of DOF 3.
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Corrects the argument descriptions on the
SSPquadUPpage to match the code:$alphais the pressure stabilization parameter, not1 - Ks/Kf: it scales the pressure Laplacian added to the element's compressibility matrix. The recommended value is the one on the element's OpenSees wiki page,0.25h^2/(rho c^2), withrho c^2 = K + 4G/3written out as on the SSPbrickUP page.$Pup $Plow $Pleft $Prightare normal tractions on the solid, positive along the outward normal. They are applied in full rather than through a load pattern, and can be changed through thepressure...Sideparameters. The page called them boundary pore pressures.$k1 $k2act along the global axes, as hydraulic conductivity over the unit weight of the fluid.forceandmaterial $matNum, which the element does not answer. It now listsstress2D3,strain2D3and the queries passed on to the material, and states that the pore pressure is the velocity response of DOF 3.Companion to the OpenSees change that fixes the
SSPquadUPfluid compressibility at zero solid density and its lower-side pressure load.