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They introduce a driving force term that causes the fluid to carry the smoke towards a particular target and they also add a smoke gathering term which prevents the smoke from diffusing too much due to numerical disipation.
The core concept behind this technique is using the gradient of a blurred density field of a target shape as direction vectors to advect the velocity field of the smoke.
The resulting vector field looks like all the vectors are pointing towards the target shape.Because the start and end shape might have different densities or the smoke might lose denisty along the way,density is adder as it interpolates between the two shapes as can be seen in Figure 4.

游玩名仕田园可以从各地到达大新县城，在大新县乘车前往。
南宁-大新
南宁西乡塘客运站坐南宁-大新县的班车（快车74元/人，慢车64元/人，一般是7:30-20:30每半小时一班）。
大新-景区
大新县汽车站开通“大新-明仕-德天”旅游专线车，一般半天均可乘坐，约每40分钟一班，到明仕票价10元、到德天票价15元。
另外，南宁目前也开通了“南宁-明仕-德天”旅游直通车，直通车分为一日和两日两种。