In the indicated Plaxis versions some issues exists with the calculation of the maximum value used for the bulk modulus of water. This issue is only relevant for Undrained (A or B), Consolidation and/or Transient flow calculations
The following is happening: with an Undrained (A or B), consolidation or transient flow analysis the program calculates a bulk modulus for the water (Kw) based on the Input value of the effective soil stiffness (K’). The program by default uses a large ratio between Kw and K’ such that the Plaxis calculation obtains realistic behaviour, but not such that the Plaxis calculation has numerical problems.
Due to an incorrect rounding of conversion values from non SI-units to SI-units, the Kw value in the calculation did not have the correct value prior to PLAXIS 3D 2013.01. When this conversion value is rounded to zero, then the program will assume Kw to be equal to Kw,max, which will give a too high value for Kw.
This issue with unit conversion can have these effects:
This issue has been resolved in PLAXIS 3D 2013.01