Evaluating the Feasibility of MCNP/FDTD EMP Calculations at Altitudes above 20km
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
This report investigates the use of MCNP/FDTD for 2D EMP calculations at altitudes above 20km. The objective is to determine the feasibility of performing EMP calculations for high altitude nuclear detonations using the MCNP/FDTD codes. The work in this report indicates that the issue with running such EMP calculations lies more in MCNP than in FDTD. In general, when performing EMP calculations with MCNP/FDTD, the majority of the computation time is in getting the results from MCNP. Typically, for EMP calculations with spatial domains of about 5 to 10km in both the x and z directions, the MCNP calculations take weeks to complete and the FDTD portion of the computation only takes one to two days. The problems with running MCNP on large problems are largely due to memory issues. One issue is that MCNP requires all tally grids of a simulation to reside in the memory of a single node (128GB on snow) and this, in turn, requires multiple MCNP simulations to complete large spatial/time domain problems.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE National Nuclear Security Administration (NNSA)
- DOE Contract Number:
- AC52-06NA25396
- OSTI ID:
- 1477617
- Report Number(s):
- LA-UR--18-29614
- Country of Publication:
- United States
- Language:
- English
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