[FLASH-USERS] Error with StirTurb Run Trials
Christoph Federrath
christoph.federrath at gmail.com
Wed Mar 29 21:19:29 EDT 2017
Hi everyone,
if you want the gas to be exactly isothermal (instead of setting gamma close to unity), you can use the physics/sourceTerms/Polytrope/PolytropeMain module, which is automatically linked in from the setup
Simulation/SimulationMain/StirFromFile. Detailed information on how to use the StirFromFile unit are provided in the FLASH user guide, sections 16.3.2, 16.3.3, and 16.3.4.
These modules were used in a number of recent papers. Here are a few examples:
http://adsabs.harvard.edu/abs/2010A%26A...512A..81F <http://adsabs.harvard.edu/abs/2010A&A...512A..81F>
http://adsabs.harvard.edu/abs/2008ApJ...688L..79F <http://adsabs.harvard.edu/abs/2008ApJ...688L..79F>
http://adsabs.harvard.edu/abs/2013MNRAS.436.1245F <http://adsabs.harvard.edu/abs/2013MNRAS.436.1245F>
http://adsabs.harvard.edu/abs/2015MNRAS.448.3297F <http://adsabs.harvard.edu/abs/2015MNRAS.448.3297F>
I hope it helps. Please let me know if you have any questions.
Cheers,
Christoph
—
Christoph Federrath
http://www.mso.anu.edu.au/~chfeder <http://www.mso.anu.edu.au/~chfeder>
> On 30 Mar 2017, at 06:45, seyit at mpe.mpg.de <mailto:seyit at mpe.mpg.de> wrote:
>
> Dear Kezman,
>
> This is an easy one. You shouldn't set gamma exactly equal to 1.0. Some
> equations contain the factor (gamma-1). To achieve isothermality, just
> make gamma close to one, like 1.001.
>
> Best wishes,
> Seyit
>
>
>> Dear Flash-users,
>>
>> I have been running into a few errors while trying to run a basic StirTurb
>> problem. What I essentially did was that, from the original StirTurb
>> problem package, I only made a few noticeable changes to flash.par and
>> added "REQUIRES physics/Hydro/HydroMain/unsplit/Hydro_Unsplit" to the
>> Config file. Then I setup the problem using the command
>>
>> ./setup —auto -3d StirTurb -nxb=64 -nyb=64 -nzb=64 +ug
>>
>> and it successfully compiled.
>>
>> Running it however it proving to be a problem for me. When I set gamma to
>> 1.4, I get a successful run but when I set it to 1.000 (Hoping to achieve
>> isothermal conditions), I get an error that says:
>>
>> *DRIVER_ABORT: [hy_uhd_eigenParameters-A]: Zero or imaginary sound speed
>> has obtained! Please try other (more diffusive) slope limiter, flux,
>> order,
>> cfl, etc.*
>>
>>
>> Could you please help me decipher where I am going wrong?
>>
>> Thank in advance.
>>
>> Kezman
>>
>>
>> *Provided below is the flash.par information I am using;*
>>
>> # runtime parameters, nxb = nyb = nzb = 64
>>
>> 256^3 grid, gamma = 1.000
>>
>> xmax = 1.
>>
>> xmin = 0.
>>
>> ymax = 1.
>>
>> ymin = 0.
>>
>> zmax = 1.
>>
>> zmin = 0.
>>
>>
>> basenm = "driventurb_3d_"
>>
>> restart = .false.
>>
>>
>> # file numbers - if you restart you have to change the
>> checkpointFileNumber
>>
>> checkpointFileNumber = 0
>>
>> plotFileNumber = 0
>>
>> particleFileNumber = 0
>>
>>
>> # set the time between dumps
>>
>> checkpointFileIntervalTime = 0.01
>>
>> plotFileIntervalTime = 0.
>>
>> particleFileIntervalTime = 0.25
>>
>>
>> # set the number of steps between dumps
>>
>> checkpointFileIntervalStep = 0
>>
>> plotFileIntervalStep = 0
>>
>> particleFileIntervalStep = 0
>>
>>
>> useParticles= .false.
>>
>> pt_numX = 5
>>
>> pt_numY = 5
>>
>> pt_numZ = 5
>>
>> pt_maxPerProc=1000
>>
>> plot_var_1 = "dens"
>>
>> plot_var_2 = "pres"
>>
>> plot_var_3 = "temp"
>>
>> plot_var_4 = "velx"
>>
>> plot_var_5 = "vely"
>>
>> plot_var_6 = "velz"
>>
>>
>> plot_grid_var_1 = "mvrt"
>>
>>
>> gamma = 1.000
>>
>>
>> cfl = 0.8
>>
>> nend = 10000
>>
>> tmax = 0.05 # was originally 20.0
>>
>>
>> xl_boundary_type = "periodic"
>>
>> xr_boundary_type = "periodic"
>>
>> yl_boundary_type = "periodic"
>>
>> yr_boundary_type = "periodic"
>>
>> zl_boundary_type = "periodic"
>>
>> zr_boundary_type = "periodic"
>>
>> st_stirmax = 18.8478
>>
>> st_stirmin = 6.2832
>>
>> st_energy = 0.1
>>
>> st_decay = 0.5
>>
>> st_freq = 1
>>
>> eintSwitch = 1.
>>
>>
>> dtinit = 1.e-5
>>
>> dtmin = 1.e-12 # This parameter must be << minimum timestep
>>
>> # in order to avoid numerical instability
>>
>>
>> smallt = 1.e-15
>>
>> smalle = 1.e-10
>>
>>
>> # AMR refinement parameters
>>
>> #lrefine_max = 6
>>
>> #refine_var_1 = "dens"
>>
>>
>> #These parameters below are only necessary for the Uniform Grid
>>
>>
>> iProcs = 4 #num procs in i direction
>>
>> jProcs = 4 #num procs in j direction
>>
>> kProcs = 4
>>
>>
>> # When using UG, iProcs, jProcs and kProcs must be specified.
>>
>> # These are the processors along each of the dimensions
>>
>>
>> #FIXEDBLOCKSIZE mode ::
>>
>> # When using fixed blocksize, iGridSize etc are redundant in
>>
>> # runtime parameters. These quantities are calculated as
>>
>> # iGridSize = NXB*iprocs
>>
>> # jGridSize = NYB*jprocs
>>
>> # kGridSize = NZB*kprocs
>>
>>
>> #NONFIXEDBLOCKSIZE mode ::
>>
>> # iGridSize etc must be specified. They constitute the global
>>
>> # number of grid points in the physical domain without taking
>>
>> # the guard cell into account. The local blocksize is calculated
>>
>> # as iGridSize/iprocs etc.
>>
>>
>> ## -------------------------------------------------------------##
>>
>> ## SWITCHES SPECIFIC TO THE UNSPLIT HYDRO SOLVER ##
>>
>> # I. INTERPOLATION SCHEME:
>>
>> order = 3 # Interpolation order (first/second/third/fifth
>> order)
>>
>> slopeLimiter = "vanLeer" # Slope limiters (minmod, mc, vanLeer,
>> hybrid, limited)
>>
>> LimitedSlopeBeta= 1. # Slope parameter for the "limited" slope by Toro
>>
>> charLimiting = .true. # Characteristic limiting vs. Primitive limiting
>>
>>
>> use_avisc = .false. # use artificial viscosity (originally for PPM)
>>
>> #cvisc = 0.1 # coefficient for artificial viscosity
>>
>> use_flattening = .false. # use flattening (dissipative) (originally for
>> PPM)
>>
>> use_steepening = .false. # use contact steepening (originally for PPM)
>>
>> use_upwindTVD = .false. # use upwind biased TVD slope for PPM (need
>> nguard=6)
>>
>> use_hybridOrder = .true.
>>
>>
>> # Magnetic and Electric Fields:
>>
>> E_modificaton = .true.
>>
>> energyFix = .true.
>>
>> ForceHydroLimit = .false.
>>
>> prolMethod = "injection_prol"
>>
>>
>>
>> # II. RIEMANN SOLVERS:
>>
>> RiemannSolver = "Hybrid" # Roe, HLL, HLLC, LLF, Marquina
>>
>> entropy = .true. # Entropy fix for the Roe solver
>>
>> EOSforRiemann = .true. # Call EOS in Riemann flux calculations
>>
>>
>> # III. STRONG SHOCK HANDELING SCHEME:
>>
>> shockDetect = .true. # Shock Detect for numerical stability
>>
>> ## -------------------------------------------------------------##
>>
>> ## ---------------------------------------------------------------##
>>
>> ## SWITCHES SPECIFIC TO THE SUPER-TIME-STEPPING (STS) ALGORITHM ##
>>
>> ## NOTE: For details on using STS runtime parameters, please ##
>>
>> ## refer to user's guide (Driver chapter). ##
>>
>> useSTS = .false.
>>
>> nstepTotalSTS = 5
>>
>> nuSTS = 0.2
>>
>> ## ---------------------------------------------------------------##
>>
>
>
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