About
MMM model in TRANSP
The MMM model for anomalous transport is being developed at Lehigh University.
Please refer this copy of the MMM v 9.1.1 documentation from the github repository and the following
References.
Use of the MMM model is regulated by the End-user License Agreement and Terms of Use.
Use of the MMM model within the TRANSP code or separately implies acceptance of these agreements.
For any model related questions please reach out Dr. Tariq Rafiq (rafiq at lehigh.edu).
The MMM model is set with a separate namelist. The file name of this namelist is defined in the TRANSP input file using the variable MMM_TEMPLATE.
The example below sets the inputs to the MMM model. The variables in the namelist are described in the MMM documentation.
&mmm_input
! Component Model Switches (1: Enabled, 0: Disabled)
cmodel =
1 ! Weiland
1 ! DRIBM
1 ! ETGM
1 ! MTM
! MMM integer options (1: True, 0: False)
iMMM =
0 ! Separate diffusivity and convective velocity
0 ! Convert negative diffusivity to convective velocity
0 ! Allow negative diffusivity output
0 ! Modify diffusivity using solver gradients
0 ! Reduce large diffusivity due to small gradients
! MMM real options
rMMM =
100 ! max |xti| (Diffusivities)
100 ! max |xte|
100 ! max |xne|
100 ! max |xnz|
100 ! max |xvt|
100 ! max |xvp|
5D4 ! max |vti| (Convective Velocities)
5D4 ! max |vte|
5D4 ! max |vne|
5D4 ! max |vnz|
5D4 ! max |vvt|
5D4 ! max |vvp|
! Weiland integer options
iW20 =
0 ! [Effective Shear Definition] 0: use elong, 1: use gxi
! Weiland real options
rW20 =
1 ! ExB shear coefficient
0.5 ! Max diffusivity coefficient
1 ! Max convective velocity coefficient
0.316 ! kyrhos
! DBM integer options
iDBM =
0 ! [Model] 0: Default, 1: Alternate
1 ! [Frequency Direction] 0: Any, 1: Electron, -1: Ion
0 ! [Mode Handling] 0: Most unstable mode, 1: Sum modes
7 ! Number of scanned ky modes (min 7), 0: Disable ky scan (use lower bound)
! DBM real options
rDBM =
1 ! ExB shear coefficient
0.5 ! Max diffusivity coefficient
0.05 ! Kyrhos Scan: Lower Bound
0.30 ! Upper Bound
! ETGM integer options
iETGM =
0 ! [Model] 0: Default, 1: Alternate, 2: Horton
1 ! [Jenko threshold (Horton)] 1: Electrostatic, 2: Electromagnetic
0 ! [Frequency Direction] 0: Any, 1: Electron, -1: Ion
0 ! [Mode Handling] 0: Most unstable mode, 1: Sum modes
7 ! Number of scanned ky modes (min 7), 0: Disable ky scan (use lower bound)
! ETGM real options
rETGM =
1 ! ExB shear coefficient
0.25 ! Max diffusivity coefficient
1 ! Kyrhos Scan: Lower Bound
40 ! Upper Bound
! MTM integer options
iMTM =
200 ! Number of scanned ky modes (min 200), 0: Disable ky scan (use lower bound)
! MTM real options
rMTM =
0.25 ! Max diffusivity coefficient
0.005 ! kyrhos Scan: Lower Bound
10 ! Upper Bound
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