This page describes how data is sent from NekRS to MOOSE with syncSolutions(FROM_EXTERNAL_APP). These steps are summarized in Figure 1.

Figure 1: Data transfers that occur to the MOOSE-Wrapped Nek file from NekRS

Specifically, we mean that we read from the internal arrays in NekRS and write into AuxVariables in the NekRS-wrapped input file (say, nek.i) - NOT necessarily that NekRS is sending new information to some coupled MOOSE application. A detailed breakdown of the steps is:

• For conjugate heat transfer, write NekRS boundary temperature into the temp variable. This will print out something like the following. The printed "Interpolated max/min values" refer to the max/min values once the data has been mapped to the NekRSMesh.

Extracting NekRS temperature from boundary 1
Interpolated temperature min/max values: 0.0, 1.0

• For volumetric heating, write NekRS volume temperature into the temp variable. This will print out something like the following. The printed "Interpolated max/min values" refer to the max/min values once the data has been mapped to the NekRSMesh.

Extracting NekRS temperature volume
Interpolated temperature min/max values: 0.0, 1.0

• If outputting additional quantities with outputs, write NekRS solution fields into additional variables in the Nek-wrapped input file. This will print out something like

Interpolating vel_x, vel_y NekRS solution onto mesh mirror