bc_elems_type Derived Type

Positions in levelDesc total list Its purpose is to get the treeID of BC elements size is globBC%nElems to use: levelDesc(iLevel)%total( globBC%elemLvl(iLevel)%elem%val(iElem) )

Position of this boundary in the bc_elemBuffer bc_elemBuffer is growing array initial size: globBC%nElems It is initiated in mus_init_bc_elems of mus_bc_header_module Only non-wall BC needs elemBuffer

Normal vector for each boundary element pointing into the domain. normal is a growing array with size: normal%val(3, nElems)

which is the index in the stencil corresponding to the normal vector?

bit mask for each node holding directions which have to be updated. The bitmask points into the incoming direction into the flow domain, which actually we want to update * For PUSH, we write to the incoming position, as the kernel reads it from there without propagation. * For PULL, we need to write to the inverse direction, as the kernel performs a bounce back before reading it. However, this bounced back direction actually comes from the non-existent boundary element and would point into the incoming direction, so the value has to be treated and set as if it points really into the incoming direction. bitmask is a growing array, the values are in bitmask%val(:,:) 1st index size is QQN since center is not treated for bcElems

The q-Values for the exact wall positions Its size: QQN, nElemsBC It is allocated in routine: allocateBCList assigned in routine: assignBCList