Hello surya,nnThank you so much for answering,n1) the mesh doesn't fail while preview i checked twice, but while solving after few simulation like 500 iterations it's shows same error.n2) Regarding splitting the domain, i really don't know how to do this, but if i split the domains will it not alter with mesh interfaces and effect the whole mesh?n3) Iam using lower crank speed, i ran a simulation successfully for 1:1 stroke/connecting rod for same model with 1500 rpm it went smooth.nn