DIF3D:  a code to solve one-, two-, and three-dimensional finite-difference diffusion theory problems. [LMFBR]

Derstine, K.L.

doi:10.2172/7157044

Cited by 113 publications

(40 citation statements)

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“…There are three distinct solver capabilities in DIF3D available today: a finite difference diffusion solver, DIF3D-FD [1], a transverse integrated diffusion solver DIF3D-Nodal [2][3], and the evenparity transport solver DIF3D-VARIANT [4][5]. All three solvers provide the functionality to obtain a numerical solution to the neutral particle diffusion equation for a user provided multi-group cross section set and geometry definition.…”

Section: Typical Reactor Analysis Uses Of the Dif3d Softwarementioning

confidence: 99%

“…The DIF3D software [1][2][3][4][5] is a key part of the legacy fast reactor analysis software package developed and maintained at Argonne National Laboratory. The DIF3D-VARIANT capability [4][5] has been pushed to the forefront of usage in the last decade at ANL because of improved computing resources and the focus on reactors with significant leakage.…”

Section: Introductionmentioning

confidence: 99%

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DIF3D-VARIANT Usage Guide

Smith¹

2022

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the time step, it should be clear that there is an iterative algorithm in place along with various acceleration schemes to improve performance [9]. In some software implementations, the reaction rates based upon the beginning of time step DIF3D solution are used to predict the end of time step state and even this approach can be very accurate given small enough time steps.In this context, the typical usage is to have DIF3D produce the k-eigenvalue solution to the steady state neutral particle diffusion or transport equation at the beginning and end of each time step. Given it computes the mesh-wise flux solution on the homogenized grid, the fuel cycle analysis code (REBUS) can average that solution over the time step and compute the reaction rates of interest in the Bateman equations.

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Section: Typical Reactor Analysis Uses Of the Dif3d Softwarementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

DIF3D-VARIANT Usage Guide

Smith¹

2022

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“…For the second example, the DIF3D software understands that the RTFLUX data file format is of type 1 instead and thus the correct import routine will be called for this format which is different from version 2. All of these additional options, none of which are used by current design activities, are best described in the DIF3D manual [1]. ANL/NSE-20/3 Lines 3, 6, and 14 are the title cards for the A.HMG4C, A.NIP3, and A.DIF3D blocks, respectively.…”

Section: Remaining Optionsmentioning

confidence: 99%

“…The only quantities that were not trivially computed are the median energies (last three columns of Table 87) and the leakage terms. The median energies are thoroughly defined in Chapter 3 of the DIF3D-FD manual [1]. The leakage terms are the same as one would expect with diffusion theory; these are defined in Chapter 2 of the DIF3D-FD manual and specifically in Eq.…”

Section: Solution Edit Verificationmentioning

confidence: 99%