Dear Friends

I know that the best way to learn LB is using Examples, But I have some problem in using OpenLB examples.

in Poiseuille2d:

in tmp folder , there is a LOG file :

```
[center]Velocity in lattice units: u=0.02
Reynolds number: Re=200
Lattice resolution: N=50
Extent of the system: lx=2
Extent of the system: ly=1
Extent of the system: lz=0
Grid spacing deltaX: dx=0.02
Time step deltaT: dt=0.0004
```

[/center]

1- I think dx= lx/N (2/50= .04) but in log file dx=0.02. N=50 is for X or Y? I think we must greater length in dt calculation.

I am confused !

Our computational domain is 50*100 ? or 51*101 (Zou B.C)?

2- dx is in SI system (dx = 2 cm)? or it is dimensionless?

I want to calculate Pressure drop, thus use saveAsciiData (that explained in OpenLB docs) to extract pressure data.

These values are physical or LB?

Should i use Delta_P = Delta_P [sub]LB[/sub] * dx[sup]2[/sup]/dt[sup]2[/sup] *Phro[sub]phys[/sub] ?

(thank you Timm for this!)

Thanks a lot

Best Wishes