I use the following command to define the porosity, but the system keep the porosity to be 0. how to deal with the problem. ctab,4,solid,7,0.1,4,1,1,1,0,off,0,light ctname,4,soil

MESH*> ctab,4,solid,7,0.1,4,1,1,1,0,off,0,light CELL TABLE NUMBER 4 IS SOLI

NAME = soil

COLOR INDEX = 7 POROSITY INDEX = 0

MATERIAL NUMBER = 4 SPIN INDEX = 1

GROUP NUMBER = 1 LIGHTING MATERIAL = 1

RADIATION = OFF

CONDUCTION THICKNESS = 0.000000

INITIAL FREE SURFACE MATERIAL IS LIGHT

MESH*> ctname,4,soil NAME OF CELL TABLE 4 IS soil

you can't have a solid that is porous. change your cell type to fluid

dear allan, when I change the command, the same problem happend,how can deal with it? ctab,4,fluid,7,0.5,4,1,1,1,0,off,0,light CELL TABLE NUMBER 4 IS FLUI

NAME = soil

COLOR INDEX = 7 POROSITY INDEX = 0

MATERIAL NUMBER = 4 SPIN INDEX = 1

GROUP NUMBER = 1 LIGHTING MATERIAL = 1

RADIATION = OFF

CONDUCTION THICKNESS = 0.000000

INITIAL FREE SURFACE MATERIAL IS LIGHT

MESH*> ctname,4,soil NAME OF CELL TABLE 4 IS soil

by Jove !!

you have to give a porosity index 1 in your ctab

then you have to define the porosity 1 under thermophysical models (resitstance ..) you have to suply alpha and betas

then it should work

it is described in the tutorials !

thank you for your help