3. Operands

3.1. Operands Z_ FOND, RAYON,, HAUT_EAU, and RHO_EAU

These four operands make it possible to define the parameters of the reservoir. The reservoir necessarily has the Z axis as the axis of symmetry.

◆ Z_ FOND

Z coordinate of the bottom of the tank.

◆ RAYON

Tank radius. \(R\) in But et description formulas

◆ HAUT_EAU

Height of water inside the tank. \(H\) in formulas. It is indeed a height and not a coordinate. The Z coordinate of points on the surface of the water is Z_ FOND + HAUT_EAU.

◆ RHO_EAU

Density of the water or liquid inside the tank. \(\rho_l\) in formulas.

3.2. Operands ACCE_SP_H, ACCE_FLEX_H_N, ACCE_FLEX_V, ACCE_SP_V, and ACCE_CONV_H

These operands make it possible to define the various accelerations.

◆ ACCE_SP_H

Acceleration at zero period read on the input spectrum in one of the horizontal directions. \(ZPA_h\) in formulas.

◆ ACCE_FLEX_H_N

Acceleration read on the input spectrum in one of the horizontal directions at the impulsive mode frequency n (4% spectrum). \(Sa(f_{hfh})\) in formulas.

◆ ACCE_FLEX_V

Acceleration read on the input spectrum in the vertical direction at the vertical impulse frequency (4% spectrum). \(Sa(f_{vf})\) in formulas.

◆ ACCE_SP_V

Zero-period acceleration read from the input spectrum in the vertical direction. \(ZPA_v\) refers to

◆ ACCE_CONV_H

Acceleration read on the input spectrum in one of the horizontal directions at the convective mode 1 frequency (0.5% spectrum). \(Sa(f_{c1})\) in formulas.

3.3. Operands GRAVITE and PRES_SURF_LIBR

◇ GRAVITE

Acceleration of pesanity. Null by default. Allows hydrostatic pressure to be taken into account.

◇ PRES_SURF_LIBR

Pressure value on the free surface. Null by default. This is added to the total pressure. Only pressure taken into account above the water level.

3.4. Operand NEWMARK

◇ NEWMARK =/"PC+" (by default),
            /"PC-",

Allows you to choose the Newmark combination. In equation (1.1), \(\pm\) is \(+\) in the « PC+ » case and \(-\) in the « PC- » case.

3.5. Keyword factor EVAL

Once the total pressure formula is created, there is no longer access to the various pressures that make up the total pressure. The keyword EVAL makes it possible to evaluate and store the various pressures as well as the total pressure in a table for a certain number of points in the tank. The evaluation is always done on the points of the same line, either a vertical line of the shell or a line of the bottom (\(theta\) constant).

◇ EVAL = _F (
     ◆ RHO = float,
     ◆/LIST_H = float,
       /LIST_R_FOND = float,
     ◆ LIST_EPAIS = float,
     ◇ THETA = float (default: 0.0),
     ◆ TABLE = co,
  ),

◆ RHO

Density of the tank at the points to be evaluated. We do not allow it to vary according to the points here.

◆/LIST_H

List of heights on the vertical line of the shell to be evaluated. The bottom of the tank is at 0 height.

◆/LIST_R_FOND

List of radii on the horizontal line going from the center to a low point of the shell.

◆ LIST_EPAIS

List of thicknesses corresponding to the points provided by LIST_H or LIST_R_FOND

◇ THETA

Azimuth of the line to which the points evaluated belong. Null by default, the points then have coordinates \(x\) and \(y\) respectively \(R\) and 0, in the other cases \(\cos(theta)\) and \(\sin(theta)\).

◆ TABLE

Name of the table in which the various pressures for each evaluated point will be stored.