Methods of tissue ablation avoid undesirable electrical current patterns in the heart, for example. A method of ablating scar tissue to improve the circulation of electrical current comprises receiving information relating to the flow of electrical current across a surface of biological tissue, the flow defining an upstream direction and a downstream direction. In accordance with the invention, the biological tissue is ablated to form or modify a bluff body to create a tail portion, the tail portion being aligned so as to lie on the downstream side of the bluff body and pointing away from the direction of the incoming current. The method may include the step of forming or modifying the bluff body to create a symmetrical teardrop shape. The surface of biological tissue may be a three-dimensional surface, in which case the method may include the step of mapping the surface in two dimensions to orient the bluff body.
