# The global water level for a selected phase can be

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TheGlobal water levelfor a selected phase can be specified in theWatersubtree undertheModel conditionsin theModel explorer. The drop-down menu displays the availablewater levels in the model (Borehole water levelsorUser water levels). More informationon water levels is given in Section 7.9.1.7.6TEMPERATURE CALCULATIONIn case temperature (or actually a change in temperature) is of influence on the behaviourof soils or structures (for example thermal expansion or soil freezing), PLAXIS offers thepossibility to take thermal effects into account. The calculation of a temperaturedistribution in the ground is based on thermal calculations. Defining whether and how the238Reference Manual | PLAXIS 2D 2015
MESHING AND CALCULATIONStemperature distribution should be calculated can be done by means of theThermalcalculation type field in theGeneralsection of thePhaseswindow.7.6.1CALCULATION TYPEIgnore temperatureIn theIgnore temperatureoption,no temperature distribution is calculated and the temperature effects are ignored.Earth gradientIn this option, the (inital) temperature is calculated on the basis of theThermalFlowparameters as defined in theModel conditionssubtree of theModel explorer(Page41). This is NOT a finite element calculation.Use temperatures from previous phaseIn this option, the (initial) temperature distribution in the current phase is assumedto be equal to the temperature distribution (at the end) of the parent phase. Thisoption can be used to indicate that the calculation kernel should use the temperaturedistribution of the previous step (phase) as input for the current deformation analysis.This option should NOT be used in a steady state calculation (Δt= 0) if clusters changefrom active to inactive or vice versa. In that case the temperature needs to be generatedusing one of the other options.Hint:In the case theCalculation typeis set toFully coupled flow-deformationanalysis, this option must be selected in order to take temperature effectsinto account. In this case, the temperature from the previous phase is onlyused to initialize the temperature at the beginning of the current phase, but itmay still change during the phase as a result of a time-dependent change inthermal flow boundary conditions.Steady state thermal flowThe temperature distribution is calculated by means of a steady-state thermal flowfinite element calculation. A steady-state thermal flow calculation is based on theinput ofThermal flow boundary conditions(Section 5.10). It also requires appropriatethermal model parameters to be entered in theThermaltabsheet of theMaterialswindow(Section 6.1.4).Transient thermal flowThe temperature distribution is calculated by means of a transient thermal flow finiteelement calculation. A transient thermal flow calculation is based on the input ofThermal flow boundary conditions(Section 5.10). It also requires appropriate thermalmodel parameters to be entered in theThermaltabsheet of theMaterialswindow(Section 6.1.4) and a non zero time interval.

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