[CIG-SHORT] Dimensionless parameter setup in spatial database

[Charles Williams]

Dear Chunyu,

For parameters that have no dimensions, you can use the word ‘None’.  See, for example, the spatial databases mat_genmaxwell.spatialdb and mat_powerlaw.spatialdb in examples/3d/hex8/spatialdb.

Cheers,
Charles


> On 6/07/2015, at 5:01 pm, Chunyu Liu (cliu5) <cliu5 at memphis.edu> wrote:
> 
> Hi, 
> I try to use the PYLITH to do static simulation about a strike-slip fault  and I want to use SimpleDB to implement the friction-coefficient and cohesion on the fault surface. I want to set up different coefficients in different regions. Thus, I do not want to use uniform database .
> However, SimpleDB need to set up parameter unit. The friction-coefficient is dimensionless and have no unit. 
> How can I set it up ?
> 
> 
> #SPATIAL.ascii 1
> SimpleDB {
>   num-values = 2 
> 
>   // names of the fault coeffients
>   value-names = friction-coefficient cohension
> 
>   value-units = Pa(wrong)   Pa  // units  ( I don’t know how to set up the unit, because friction-coefficient is dimensionless)
> 
>   num-locs = 12
>   data-dim = 2
>   space-dim = 3
> 
>   cs-data = cartesian {
>     to-meters = 1.0
>     space-dim = 3
>   }
> }
> // Columns are
> // (1) x coordinates(m)
> // (2) y coordinates(m)
> // (3) z coordinates(m)
> // (4) friction_coefficient
> // (5) cohension(Pa)
> -163000 300000 0            1     0
> -163000 300000 -120000      1     0
> -111000 222000 0            1     0
> -111000 222000 -120000      1     0 
> -109000 219000 0            0.6   0 
> -109000 219000 -120000      0.6   0 
> 109000 -108000 0            0.6   0
> 109000 -108000 -120000      0.6   0 
> 111000 -111000 0            1     0 
> 111000 -111000 -120000      1     0 
> 237000 -300000 0            1     0
> 237000 -300000 -120000      1     0
> 
> 
> Thank you for your time and further suggestions. 
> 
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Charles A. Williams
Scientist
GNS Science
1 Fairway Drive, Avalon
PO Box 30368
Lower Hutt  5040
New Zealand
ph (office): 0064-4570-4566
fax (office): 0064-4570-4600
C.Williams at gns.cri.nz <mailto:C.Williams at gns.cri.nz>
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