ansys中计算温度时的sf命令命令如下：lsel,s,1,4,1lsel,a,13,16,1nsll,s,1SF,all,RDSF,0.85,-1,问：SF命令后0.85sgi代表的什么?后面的-1代表什么?
ansys中计算温度时的sf命令
命令如下：
lsel,s,1,4,1
lsel,a,13,16,1
nsll,s,1
SF,all,RDSF,0.85,-1,
问：SF命令后0.85sgi代表的什么?后面的-1代表什么?
RDSF(surface-to-surfaceradiation).面到面的辐射
IfLab=RDSF,VALUEistheemissivityvalue;0.85是辐射率,thefollowingconditionsapply:IfVALUEisbetween0and1,applyasinglevaluetothesurface.
IfLab=RDSF,VALUE2istheenclosurenumber.Radiationwilloccurbetweensurfacesflaggedwiththesameenclosurenumbers.Iftheenclosureisopen,radiationwillalsooccurtoambient.IfVALUE2isnegativeradiationdirectionisreversedandwilloccurinsidetheelementfortheflaggedradiationsurfaces.NegativevalueofenclosurenumberisapplicableforFLUID141andFLUID142elements,tomodelradiationoccurringbetweensurfacesinsidethefluiddomain.-1代表向单元内部辐射