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Post-processing: comparing with and without breakwater

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This commit is contained in:
Edgar P. Burkhart 2022-03-09 15:23:06 +01:00
parent 5c05d6ea34
commit f4ccdb009a
Signed by: edpibu
GPG key ID: 9833D3C5A25BD227
2 changed files with 59 additions and 12 deletions
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1
swash/config.ini
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@ -21,6 +21,7 @@ mpi=4
[post]
inp=inp_post
case=sws_spec_buoy.npz
compare=sws_spec_buoy_nb.npz
out=out_post
#nperseg=1024
dt=0.25

68
swash/processing/post.py
View file

@ -5,7 +5,6 @@ import pathlib
import matplotlib.pyplot as plt
import numpy as np
import pandas as pd
import scipy.signal as sgl
import scipy.fft as fft
@ -25,7 +24,7 @@ config.read("config.ini")
inp = pathlib.Path(config.get("post", "inp"))
root = pathlib.Path(config.get("swash", "out"))
log.info(f"Reading bathymetry from '{inp}'")
log.info(f"Reading data from '{inp}'")
data = np.load(inp.joinpath(config.get("post", "case")))
x, t = data["x"], data["t"]
@ -42,15 +41,48 @@ log.info(f"Computing reflection coefficient at x={x0}")
eta = data["watl"][t > t0, arg_x0]
u = data["vel"][t > t0, 0, arg_x0]
phi_eta = np.abs(sgl.welch(eta, f, nperseg=nperseg))
phi_u = np.abs(sgl.welch(u, f, nperseg=nperseg))
phi_eta_u = np.abs(sgl.csd(eta, u, f, nperseg=nperseg))
phi_eta = sgl.welch(eta, f, nperseg=nperseg)
phi_u = sgl.welch(u, f, nperseg=nperseg)
phi_eta_u = sgl.csd(eta, u, f, nperseg=nperseg)
H = np.sqrt(np.abs(phi_eta[1]))
U = np.sqrt(np.abs(phi_u[1]))
G = H / U
th_eta_u = np.angle(phi_eta_u[1])
# R1 = np.sqrt(
# (np.abs(phi_eta[1]) + np.abs(phi_u[1]) - 2 * np.abs(phi_eta_u[1]))
# / (np.abs(phi_eta[1]) + np.abs(phi_u[1]) + 2 * np.abs(phi_eta_u[1]))
# )
R = np.sqrt(
(phi_eta[1] + phi_u[1] - 2 * phi_eta_u[1])
/ (phi_eta[1] + phi_u[1] + 2 * phi_eta_u[1])
(1 + G**2 - 2 * G * np.cos(th_eta_u))
/ (1 + G**2 + 2 * G * np.cos(th_eta_u))
)
if config.has_option("post", "compare"):
data_comp = np.load(inp.joinpath(config.get("post", "compare")))
x_, t_ = data_comp["x"], data_comp["t"]
arg_x0_ = np.abs(x_ - x0).argmin()
arg_t0_ = np.abs(t_ - t0).argmin()
eta_ = data_comp["watl"][t_ > t0, arg_x0_]
u_ = data_comp["vel"][t_ > t0, 0, arg_x0_]
phi_eta_ = sgl.welch(eta_, f, nperseg=nperseg)
phi_u_ = sgl.welch(u_, f, nperseg=nperseg)
phi_eta_u_ = sgl.csd(eta_, u_, f, nperseg=nperseg)
H_ = np.sqrt(np.abs(phi_eta_[1]))
U_ = np.sqrt(np.abs(phi_u_[1]))
G_ = H_ / U_
th_eta_u_ = np.angle(phi_eta_u_[1])
R_ = np.sqrt(
(1 + G_**2 - 2 * G_ * np.cos(th_eta_u_))
/ (1 + G_**2 + 2 * G_ * np.cos(th_eta_u_))
)
# Plotting
log.info("Plotting results")
fig, (ax_watl, ax_vel) = plt.subplots(2)
@ -77,9 +109,17 @@ ax_fft.plot(
lw=1,
c="k",
alpha=0.2,
label="PSD ($\\eta$)",
label="PSD ($\\eta$, cas 1)",
)
ax_r.plot(phi_eta[0], R, marker="+", label="R")
ax_fft.plot(
*sgl.welch(eta_, 1 / dt, nperseg=nperseg),
lw=1,
c="k",
alpha=0.2,
label="PSD ($\\eta$, cas 2)",
)
ax_r.plot(phi_eta[0], R, marker="+", label="R (cas 1)")
ax_r.plot(phi_eta[0], R_, marker="+", label="R (cas 2)")
ax_r.set(xlim=(0, 0.3), ylim=(0, 1), xlabel="f (Hz)", ylabel="R")
ax_fft.set(ylim=0, ylabel="PSD (m²/Hz)")
ax_r.grid()
@ -89,11 +129,16 @@ fig_r.tight_layout()
fig_x, ax_x = plt.subplots(figsize=(10, 1))
ax_x.plot(data["x"], -data["botl"], color="k")
ax_x.fill_between(
ax_x.plot(data["x"], -data_comp["botl"], color="k", ls="-.")
ax_x.plot(
data["x"],
-data["botl"],
np.maximum(data["watl"][arg_t0, :], -data["botl"]),
)
ax_x.plot(
data["x"],
np.maximum(data_comp["watl"][arg_t0, :], -data_comp["botl"]),
ls="-."
)
ax_x.axvline(x0, c="k", alpha=0.2)
ax_x.set(xlabel="x (m)", ylabel="z (m)")
ax_x.autoscale(axis="x", tight=True)
@ -107,5 +152,6 @@ out.mkdir(parents=True, exist_ok=True)
fig.savefig(out.joinpath("t.png"))
fig_r.savefig(out.joinpath("R.png"))
fig_x.savefig(out.joinpath("x.png"))
plt.show(block=True)
log.info("Finished post-processing")