Hi, could I change the uniform velcocity as 0

[liangaomng]

Hi, sir,

Should I can change the fluid uniform velcocty as 0, like this?
But it stop the first step. I want to simulate the still water with a motion cylinder.

function circle(n,m;Re=250,U=0,mem=Array,angle = 0,radius=m/8,velocity=0.1,center=m/2)
hori_distance = m/4 #128/4=32
angle_rad = angle * (π / 180) # π / 180
vert_distance = hori_distance * tan(angle_rad)
radius, center = radius,center+ vert_distance
#motion
function map(x,t)
x = x + SA[velocity*t,0]
end

circle = AutoBody((x,t)->√sum(abs2, x .- SA[n/2-velocity*1t,center]) - radius, map)

Simulation((n,m), (0,0), radius;ν= 0.005,body=circle, mem)

end

Thanks

[weymouth]

You need to set the velocity scale argument. See https://github.com/WaterLily-jl/WaterLily-Examples/blob/b37af77c6dd60f5d08f963d067e4a52e37a23018/examples/TwoD_Hover.jl#L6 or https://github.com/WaterLily-jl/WaterLily-Examples/blob/b37af77c6dd60f5d08f963d067e4a52e37a23018/examples/TwoD_LidCavity.jl#L41 or https://github.com/WaterLily-jl/WaterLily-Examples/blob/b37af77c6dd60f5d08f963d067e4a52e37a23018/examples/TwoD_SlowStartCircle.jl#L5 or https://github.com/WaterLily-jl/WaterLily-Examples/blob/b37af77c6dd60f5d08f963d067e4a52e37a23018/examples/TwoD_Channel.jl#L48 for examples