Fix velocity in FlowAroundSphere

apps/gpu/FlowAroundSphere/FlowAroundSphere.cpp

@@ -156,7 +156,7 @@ int main(int argc, char *argv[])
 
         const real velocityLB = velocity * dt / dx; // LB units
 
-        const real vxLB = velocityLB / sqrt(2.0); // LB units
+        const real vxLB = velocityLB; // LB units
 
         const real viscosityLB = nx * velocityLB / Re; // LB units