# The sediment parameters in flml are MKS system of units ?

Hi all,

Are the diameter and other inputs about sediments in flml all used MKS system of units ?

Liu

## Question information

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liu chin chi
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## This question was reopened

 Revision history for this message Jon Hill (jon-hill) said on 2014-04-25: #1

Grain diameter is in mm, all others should be in MKS. See the mms_sediment test for some example values.

Hope that helps

 Revision history for this message liu chin chi (caite8001) said on 2014-04-26: #2

Hi Jon

You hit it. I'm confused with the diameter unit in "mms_sediment" .

 Revision history for this message Jon Hill (jon-hill) said on 2014-04-26: #3

It's in millimetres

(i.e. 1 == 1x10-3 m)

On 26/04/14 03:56, liu chin chi wrote:
> Question #247553 on Fluidity changed:
>
>
> liu chin chi confirmed that the question is solved:
> Hi Jon
>
> You hit it. I'm confused with the diameter unit in "mms_sediment" .
>
>

 Revision history for this message liu chin chi (caite8001) said on 2014-04-26: #4

Hi Jon

So the units be used in sediment as below ?

Sediment initial condition kg/m^3
Diameter mm
Diffusivity mm^2/sec
Viscosity mm^2/sec
Sinking velocity mm/sec
UnhinderedSinking velocity mm/sec

 Revision history for this message Jon Hill (jon-hill) said on 2014-04-27: #5

Sediment initial condition % concentration as a fraction of 1 (i.e. we
expect it to be very small in order for the model to be valid < 0.1 (i.e
10%) typically)
Diameter mm
Diffusivity m^2/sec
Viscosity m^2/sec
Sinking velocity m/sec
UnhinderedSinking velocity m/sec

Hope that helps,

Jon

On 26/04/2014 12:46, liu chin chi wrote:
> Question #247553 on Fluidity changed:
>
> Status: Solved => Open
>
> liu chin chi is still having a problem:
> Hi Jon
>
> So the units be used in sediment as below ?
>
> Sediment initial condition kg/m^3
> Diameter mm
> Diffusivity mm^2/sec
> Viscosity mm^2/sec
> Sinking velocity mm/sec
> UnhinderedSinking velocity mm/sec
>

--
Dr Jon Hill
Research Fellow
AMCG, Earth Science and Engineering
Imperial College London
Mob: 07748254812
Phone: +44(0)2075949321

 Revision history for this message liu chin chi (caite8001) said on 2014-04-27: #6

Thanks a lot.

Liu

 Revision history for this message liu chin chi (caite8001) said on 2014-04-27: #7

Thanks Jon Hill, that solved my question.

 Revision history for this message liu chin chi (caite8001) said on 2014-05-02: #8

Hi Jon,

It seems the same order of suspension load(volume of fraction), but i'am not sure if the unit is 1/sec.