ForceMain.hpp

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// SPDX-License-Identifier: Apache-2.0
//
// Copyright 2026 Caleb Buahin
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

 
#ifndef OPENSWMM_FORCEMAIN_HPP
#define OPENSWMM_FORCEMAIN_HPP
 
namespace openswmm {
 
namespace forcemain {
 
constexpr double VISCOS = 1.1e-5;  
 
enum class FrictionModel : int {
    HAZEN_WILLIAMS = 0,
    DARCY_WEISBACH = 1
};

double getFricSlope_HW(double velocity, double hyd_rad, double c_hw);

double getFricSlope_DW(double velocity, double hyd_rad, double roughness);

double getEquivN(FrictionModel model, double r_bot, double y_full,
                 double slope, double n_raw);

double getRoughFactor(FrictionModel model, double r_bot, double length_factor);

double getFricFactor(double r_bot, double hrad, double re);

void batchFricSlope(const double* velocity, const double* hyd_rad,
                    const double* param, double* fric_slope,
                    FrictionModel model, int count);
 
} // namespace forcemain
} // namespace openswmm
 
#endif // OPENSWMM_FORCEMAIN_HPP