How we control the dimensions of the model

Hi Jabrane,

there are no physical dimensions in Yade, just numbers [1,2] :-) Depending
on what you give on input, you get on output.

example:
distance = 10
time = 2
velocity = length/time = 5

if you have [distance]=m, [time]=s, then velocity is 5 m/s
if you have [distance]=km, [time]=s, then velocity is 5 km/s
if you have [distance]=km, [time]=h, then velocity is 5 km/h
if you have [distance]=feet, [time]=day, then velocity is 5 feet/day

but the number 5 is always the same, but its meaning depend on what is
acually distance and time. Yade works the same, it just computes numbers,
regardless their physical meaning. The results of Yade are again just
numbers. What is the physical dimension of the results depends on what you
consider is physical dimension of inputs.

So you can have any physical dimension, you only have to be consistent.

cheers
Jan

[1] https://answers.launchpad.net/yade/+question/170564
[2] https://answers.launchpad.net/yade/+question/251125

2015-08-06 11:16 GMT+02:00 Yor1 <email address hidden>:

> New question #270057 on Yade:
> https://answers.launchpad.net/yade/+question/270057
>
> Hi everyone,
>
> When we create the model, we have to define the coordinates of upper
> corner and lower corner.
> how do i to have the dimensions in millimeters and not in centimeters ?
>
> Jabrane.
>
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Thank you for your answer.

If we have two beams with these dimensions 240x80x30 cm and 240x80x30 mm, we won't have the same intensity of load on these beams.
But in Yade and in the two cases i have to put 240x80x30 regardless of the dimensions.
The results obtained is for 240x80x30 cm or 240x80x30 mm ?

Jabrane

With reference to my first answer, the results is for 240x80x30 :-)

> But in Yade and in the two cases i have to put 240x80x30 regardless of the
> dimensions.
>

why do you have to? Somebody force you to do so? :-) if you don't want to
play with physical units, the easiest approach is to consider everything in
basic SI units, i.e. length in meters

240x80x30 cm = 2.4x0.8x0.3 m
240x80x30 mm = 0.24x0.08x0.03 m

cheers
Jan