<html><body><div style="direction: ltr; font-family: Aptos, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">Dear FLASH users,</div><div style="direction: ltr; font-family: Aptos, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);"><br></div><div style="direction: ltr; font-family: Aptos, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">I am working through the laser slab example and have a question. Depending on plasma composition, for some frequency groups the system can be optically thin while for other frequency groups it could be optically thick. For the optically thick groups, FLASH handles radiation transport via a diffusion solver. However, for the case of optically thin regions, I would think one would want to include energy loss from radiation emission alone, but not include radiation transport (simply because that emitted radiation does not interact with the plasma). Does anybody know if there a way one can ‘turn off’ radiation transport for some frequency groups while still taking into account energy losses from emission?</div><div style="direction: ltr; font-family: Aptos, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);"><br></div><div style="direction: ltr; font-family: Aptos, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">Thanks,</div><div style="direction: ltr; font-family: Aptos, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">Paul Chesler</div></body></html>